Doing morning exercises is ···?用is还是are?应该用is吧?还有Spending weekend is···对吧?因为这是件事情对吧?用is

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Doingmorningexercisesis···?用is还是are?应该用is吧?还有Spendingweekendis···对吧?因为这是件事情对吧?用isDoingmorningexercis

Doing morning exercises is ···?用is还是are?应该用is吧?还有Spending weekend is···对吧?因为这是件事情对吧?用is
Doing morning exercises is ···?
用is还是are?应该用is吧?
还有Spending weekend is···对吧?
因为这是件事情对吧?用is

Doing morning exercises is ···?用is还是are?应该用is吧?还有Spending weekend is···对吧?因为这是件事情对吧?用is
is,Doing morning exercises是一件事情,is指的是这件事情,同样的,spending weekend是一种做法,当然也用is,理解了?