[ Tenses ]
I’m tired. I _____ the house since 9 this morning.
A. am cleaning
B. was cleaning
C. had been cleaning
D. have been cleaning

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Present/Past/Past ParticplePresent/Future/Past Simple/Present PerfectVerb Tense, Pronouns and AntecedentsArticle & PrepositionComparative AdverbsTo infinitive - GerundVerbs and AdverbsMaritime Vocabulary and GrammarQuantifiers & Modals of ObligationPast Tense and Perfect TenseOther quiz:
Grammar › ViewIt’s cheap, ______, I wouldn’t buy it
A. and
B. because
C. however
D. so
Grammar › View
Let’s go to……zoo.
A. a
B. an
C. the
D. X
Grammar › ViewMy brother is clever ……. tall.
A. and
B. or
C. but
Comma › View
Which sentence is written correctly?
A. The busy servers took orders and delivered meals to hungry customers.
B. The busy servers took orders, and delivered meals to hungry customers.
C. The busy servers, took orders and delivered meals to hungry customers.
D. The busy servers, took orders and delivered meals, to hungry customers.
