[ Present Perfect Continuous Tense ]
The Scientist mixes the formula
A. The Scientist has been mixing the formula
B. The Scientist has been mixxing the formula

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Tenses and StructureGrammar - QuantiflierPast simple vs Present perfectWas and WereMaritime Vocabulary and GrammarVerb AbilityPast Perfect TenseFuture TensesModals and Active and Passive VoiceLinking Words & PhrasesOther quiz:
Suffixes and Tenses › ViewIdentify the present tense form of the verb “drive” and use it in a sentence.
A. Drove; “He drove to work yesterday.”
B. Driven; “He has driven to work.”
C. Drive; “He can drive very well.”
D. Drives; “He drives to work every day.”
Grammar › View
It started to rain _________ we cancelled the picnic.
A. as
B. but
C. since
D. so
Vocabulary and Grammar › View. My wife’s mother is my _______.
A. aunt
B. mother-in-law
C. sister
D. mother
Personal Pronouns › View
… are watching TV. (my mother and I)
A. Them
B. We
C. They
D. You
