TinyProf's Guide to Subject Clause Islands 🎓

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1. What We're Solving

We need to determine whether subject clauses act as syntactic islands — meaning, do they trap elements inside them, preventing relative clause formation from reaching in and extracting those elements?

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2. The Approach

Here's the big picture strategy:

Think of syntactic islands like locked rooms. If a subject clause is an island, you cannot "reach inside" it to relativize (or question, or topicalize) an element. We test this by deliberately trying to extract elements from inside subject clauses and asking: Does the sentence break?

We need to test multiple variables systematically:

• With vs. without a complementizer (that)
• Extracting an argument (like the object or subject of the embedded clause)
• Extracting an adjunct (like a time or place expression)

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3. Step-by-Step Solution

🔑 Step 1: Understand the Key Terms

| Term | Plain English Meaning | |---|---| | Subject clause | A clause that functions as the subject of the main verb (e.g., "That Mary ate the cake" as the subject of "made you angry") | | Relativization | Forming a relative clause by moving (extracting) an element, leaving a trace (t) behind | | Syntactic island | A structural domain you cannot extract out of | | Complementizer | The word "that" introducing an embedded clause |

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🔑 Step 2: Identify the Baseline Structure

Start with a simple, well-formed sentence:

> "That Mary ate the cake made you angry."

Here, the entire subject clause = "That Mary ate the cake" The main predicate = "made you angry"

Now, can we relativize the cake or Mary out of this subject clause? This is what we're testing! 🎯

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🔑 Step 3: Test Extraction of an Object Argument

Try to relativize the cake (the object inside the subject clause):

> ❓ "the cake which [that Mary ate t] made you angry"

Here:

• the cake moved to become the head of the relative clause
• It left a trace (t) inside the subject clause
• The extraction crosses the boundary of the subject clause

Most speakers judge this as severely ungrammatical (*) — the subject clause is acting like a locked room!

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🔑 Step 4: Test Extraction of the Subject Argument

Now try to relativize Mary (the subject inside the embedded clause):

> ❓ "Mary who [t ate the cake] made you angry"

Here extraction is from the subject position of the embedded clause. This involves the Subject Island Constraint (part of Ross's original island typology from 1967), where extracting from subject position is generally even more degraded than extracting from object position.

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🔑 Step 5: Test the Role of the Complementizer (that)

Compare these two versions:

> (a) "the cake which [that Mary ate t] made you angry" > (b) "the cake which [Mary ate t] made you angry"

• In (a): the complementizer that is present
• In (b): the complementizer is absent (null)

For subject clauses, both versions remain ungrammatical — the island effect holds regardless of whether that appears. This shows the island is a property of the structural position (being a subject), not just the presence of that.

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🔑 Step 6: Test Adjunct Extraction

Now test whether adjuncts (like yesterday or in the kitchen) can be extracted:

> ❓ "the place where [Mary ate the cake t] made you angry"

Adjuncts are typically even harder to extract than arguments (this is the Adjunct Island Constraint). So if arguments are already blocked, adjuncts will be doubly bad. ✗✗

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🔑 Step 7: Contrast With Non-Subject Clause Extraction (Control Condition)

Compare subject clause extraction to extraction from an object clause:

> ✅ "the cake which Mary said [that she ate t]" → Grammatical!

Here the embedded clause is an object of said, NOT a subject. Extraction works fine! This contrast is crucial — it shows the ungrammaticality is specifically tied to subject position, not embedded clauses in general. 💡

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🔑 Step 8: Connect to Theoretical Explanations

Several theories explain why subject clauses are islands:

Theory 1 — Ross (1967): The Complex NP / Sentential Subject Constraint > A sentence cannot be moved from an embedded clause that functions as a sentential subject. This was one of Ross's original island constraints! 📜

Theory 2 — The Specifier Island Constraint > Subjects occupy [Spec, TP] or [Spec, CP] — positions that are structurally "enclosed" and difficult to escape from.

Theory 3 — The ECP (Empty Category Principle) — Government & Binding > Traces must be properly governed. Subject positions are often not properly governed, making traces there illicit.

Theory 4 — Phase Theory (Minimalism) > Subject clauses may form separate phases, and elements inside a phase cannot be accessed from outside once the phase is "closed."

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4. The Answer (Framework)

Here's how to summarize your findings systematically:

| Construction Tested | Grammatical? | What This Shows | |---|---|---| | Extract object from subject clause (with that) | ✗ Ungrammatical | Subject clause blocks extraction | | Extract object from subject clause (without that) | ✗ Ungrammatical | Complementizer not the cause | | Extract subject from subject clause | ✗ Ungrammatical | Subject island + sentential subject island stacked | | Extract adjunct from subject clause | ✗✗ Very bad | Adjunct islands compound the effect | | Extract from object clause (control) | ✅ Grammatical | Island is specifically about subject position |

Conclusion: Subject clauses do function as syntactic islands for relativization. The extraction dependency cannot cross the boundary of a subject clause regardless of argument type, adjunct type, or complementizer presence. This is consistent with the Sentential Subject Constraint and is supported by multiple theoretical frameworks.

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5. Memory Tip 🧠

Think of SUPER = Subject Clauses Universally Block Extraction Reliably

Or use this image: imagine the subject clause as the foundation of a house 🏠. You can't pull bricks out of the foundation without the whole structure collapsing — that's what extraction from a subject clause does to the grammar!