[ Relative Clauses ]
The idea which Barry thought of is great.
A. “Which” can be both omitted and swapped for “that”
B. “Which” can be omitted but can’t be swapped for “that”
C. “Which” can’t be either omitted or swapped for “that”
D. “Which” can’t be omitted but can be swapped for “that”

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Adverbial Clause / If / ComparativesInfinitive or GerundComparatives and ConjunctionsPrepositions and Phrasal VerbsComparative and Superlative AdjectivesContrast Linking WordsPresent Simple and Present Continuous TensesGrammar Present Perfect (ever never)Parallelism and Subject Verb AgreementPassive Voice in Past Simple TenseOther quiz:
Grammar › ViewHas he got straight hair?
A. Yes, he has.
B. No, he hasn’t.
Present Perfect Continuous › View
The gerund form of the verb “Write” is:
A. Writing
B. Writting
C. Written
D. Wrote