I’mleavingnow.—youturnoffthelightsandthecomputer.—I’mleavingnow.—youturnoffthelightsandthecomputer.A.TomakesureB.MakesureC.MadesureD.Makingsure为什么选B,顺便问一下,什么时候用原型,什么时

Question

I’m leaving now.—_ you turn off the lights and the computer.
—I’m leaving now.—______ you turn off the lights and the computer.A.To make sure B.Make sure C.Made sure D.Making sure
为什么选B,顺便问一下,什么时候用原型,什么时候用ing和不定式

Answer 1

因为是祈使句,动词不能用任何时态,得用原形；
一个句子,当动词开头,做主语的时候,就用ing或to do
如 Eating too much is bad for your health.这里eat是动词,作主语要把它变成名词,就得加上ing