[ Tenses ]
You ________ (leave) the office when it _______ (start) to rain.
A. is leaving, starts
B. was leaving, started
C. was leaving, starts
D. is leaving, started

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Singular and Plural NounsIf ConditionalsPersonal & Possessive Pronounstoo / enoughGerund & InfinitivePresent Tenses: Simple vs ContinuousThings in EnglishAuxiliaries VerbGrammar - much, many, a lot ofAdjectives & PrepositionOther quiz:
Present Perfect Tense › ViewHave the students played tennis?
A. No, they haven´t.
B. Yes, they has.
C. No, the didn´t.
D. Yes, they hasn´t
Adjective › View
You look ___. What’s wrong?
a.worried
b.worrying