working和helpful分別怎麼用 hard

由題意可知：從詞法上講heIpfuI，和hard-working都是形容詞。從詞意上講：hard-working是勤奮的，賣力的，它在句子中往往作定語，後面跟名詞。

My mother is a hard-working and well spoken woman.

句中hard-workin9作定語，修飾woman

helpful是有幫助的，有力的，它在句子由往往作表語。

To read a lot is helpful to the students.

句中helpful作表語