[ Mixed Tenses ]
I don’t think he ____________in the thirty years I _______________ him.
A. has changed/have known
B. had changed/have known
C. had changed/had known
D. has changed/knew

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So Such Enough TooTenses and VerbsWH Questions and Simple Past TenseAdverbial Clause of ConcessionPronoun & Present SimpleAll, Both, Neither, None, EitherSimple Present and Present ContinuousVerb PatternsNouns and QuantifiersPresent PerfectOther quiz:
Quantifiers › View“How much” is used to ask about quantity with…
A. Countable nouns
B. Uncountable nouns
Grammar › View
She says if she _____ that the traffic lights were red she _____.
A. had realized/ would stop
B. realized/ could have stopped
C. has realized/ stopped
D. had realized/ would have stopped
Simple Past Tense › ViewHow many days / John / stay / there?
A. How many days did John stay there?
B. How many days John stayed there?
C. How many days John stay there?
Grammar › View
Has he got curly hair?
A. Yes, he has.
B. No, he hasn’t.