[ Grammar - could / could not ]
Could you __________ when you were ten years old?
A. swam
B. swim
C. swum
D. swimming

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Grammar › ViewWhat part of speech is the word ‘on’ in the sentence ‘The book is on the shelf’?
A. Preposition
B. Verb
C. Adjective
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Grammar › View
She says she may be available Friday
A. probability
B. obligation
C. advice
D. polite request