There are some opinions about Covid-19, except …
A. It changes the education system
B. It is a problem in economy
C. It is very risky for the health
D. It spreads slowly

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Simple Present Tense vs Present Continuous TenseZero & First ConditionalGrammar - Countable/ UncountablePast Continuous Tense & Past ModalsPast Tense and NeutralLinkers and ConjunctionsSubject-Verb AgreementAdverbial Clause, Noun ClauseAdjectives and PronounsWishes & Reported SpeechOther quiz:
Modals › ViewThey _____ make a decision by tomorrow.
A. must
B. has to
C. had to
D. used to
Grammar › View
Identify the sentence as simple, compound, or complex. “The history of Black Friday dates back to the early 1960s when police in Philadelphia used the term to describe the chaos that ensued the day after Thanksgiving.”
A. Simple
B. Compound
C. Complex
Grammar › ViewConcentration is ________ by alertness.
A. Help
B. Will help
C. Helps
D. Helped
Past Perfect Tense and Past Tense › View
When we were in elementary school, we ……… (not/learn) past perfect tense before we got English course.
A. have learnt
B. had not learnt
C. were learning
D. have not been learnt
