[ Past Perfect Simple & Past Perfect Continuous ]
I realized that I (forget) to thank them.
Which is the correct past perfect simple for the sentence above?
A. had forget
B. has forgotten
C. having to forget
D. had forgotten
Select your answer:

Random Topics:
Infinitive GerundModals for RecommendationsThe First Conditional SentencePunctuationTenses and StructuresGrammar: is/are/was/werePrepositions after VerbsPossessive NounsVerb Tenses and ModalsAdjectives & AdverbsOther quiz:
Frequency Adverbs › ViewMy parents don’t carry cash with them – they _____ pay by credit card.
A. usually
B. never
Homonyms › View
There is a rich ___ of comedy in Mike Nichol’s movies.
a. vane
b. vain
c. vein
