they both study very hard.=(_) (_) (_) study very hard.

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they both study very hard.=(_) (_) (_) study very hard.

they both study very hard.=(_) (_) (_) study very hard.
they both study very hard.=(_) (_) (_) study very hard.

they both study very hard.=(_) (_) (_) study very hard.
Both of them

BOTH OF THEM

Both of them study very hard.

(Both) (of) ( them) study very hard.
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