比如這三句話（1）In fact,they are entertaining for both children and adults.
這是一個現(xiàn)在進(jìn)行時態(tài)的句子,“be+動詞ing”形式構(gòu)成進(jìn)行時態(tài),be為現(xiàn)在式時構(gòu)成現(xiàn)在進(jìn)行時態(tài)；
（2）Jenny was walking to the store with her sister.
這是一個過去進(jìn)行時態(tài)的桔子,“be+動詞ing”形式構(gòu)成進(jìn)行時態(tài),be為過去式時就構(gòu)成過去進(jìn)行時態(tài)；
（3）The children really like making presents for their parents.
這是一個一般現(xiàn)在時態(tài)的句子,making presents for their parents作為動名詞短語,在句子中作like的賓語.