[ Subject-Verb Agreement ]
My mother has ____ (do) a lot of important stuff for me.
A. Do
B. Does
C. Doing
D. Done

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Gerunds and InfinitivesPresent Simple x Present ContinuousCommasPronouns, Sentence Structure, and Figurative LanguageWill & Be going toMixed ConditionalsVerbs & Verb TensesActive vs. Passive VoiceCorrelative Conjunction & Complex SentencesDependent PrepositionOther quiz:
Grammar and Vocabulary › View. I try to avoid driving in the _____ hour.
A. busy
B. rush
C. fast
Modals for Necessity and Suggestions › View
Choose the correct use of the modal in this sentence:
You don’t have to take a lesson.
A. Necessity
B. Lack of necessity
C. Recommendation
Grammar › ViewThe knee is the joint …………… the thigh bone meets the large bone of the lower leg.
A. when
B. where
C. why
D. which
Conjunction › View
Siti says we should eat enough … be healthy.
A. to
B. in order to
C. so that
D. although