[ Tenses ]
When he ___________________ (found) Microsoft, Bill Gates was only 20 years old.
A. found
B. founded
C. had found
D. had founded
Select your answer:

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Modal Verbs and PermissionGerund after Prepositions and Certain VerbsPrepositions and Prepositional PhrasesSubordinating ConjunctionsAdjectives-Comparison, SuperlativePresent, Past, Present Perfect and ComparativePresent and Past Perfect TensesOpinion / AgreementSimple, Complex, Compound SentenceGrammar and ReadingOther quiz:
Vocabulary › ViewWhat does ‘turn down’ mean?
A. to accept
B. to refuse
C. to agree
D. to negotiate
Present Perfect Tense › View
I …. her this week.
A. hasn’t see
B. haven’t see
C. hasn’t seen
D. haven’t seen
