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exercise exercises does sport do sports
should he; take exercise must he; takes exercises he can; does some exercises he ought to; do some practice
should he;take exercise must he;takes exercises he can;does some exercises he ought to;do some practice
How many How often How long When
working；doing working；to do a
How many How often How long What time
the less; the stronger the more, the thinner the more; the stronger more; stronger
did does will do is doing
because of such as as for as well
Is；do；is Does； does；does Does；do； does Do； does；does
should he; take exercise must he; take exercises he can; does some exercises he ought to; do some practice
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