[ Perfect Verb Tenses ]
Last month, Rohan and Emma were working on a project when YAZAN noticed that one of the machines failed to measure the migration patterns. Can you identify the tense used in this sentence?
A. Past perfect tense
B. Present perfect tense
C. Future perfect tense
D. Past tense

Random Topics:
Passive ModalsPronouns and AdverbsPresent Simple PassiveRoot WordTOEFL GrammarModal and Phrasal VerbsGrammar and VocabulariesInfinitive and GerundsAuxiliary Verbs (be, do, have)Employment VocabularyOther quiz:
Grammar and Vocabulary › ViewThis book is ________ interesting than the one I read before.
A. not
B. less
C. least
Present Progressive › View
Mary and Peter ____ __________ the house
A. is painting
B. am painting
C. are painting
D. painting
Conjunctions › ViewWhat conjunction introduces a reason? “___ it was late, we decided to call it a day.”
A. Since
B. Although
C. If
Idioms › View
To “veg out” means to ___.
a. get angry
b. get excited
c. relax
