call on sb to do

to do sth作宾补.是来补充宾语所做的动作.

to do

号召某人做某事,呼吁某人做某事 The UN has called on both sides to observe the ceasefire. 联合国已经呼吁双方停火.

call是实义动词,应该是call sb. to do sth.只有let, had better, help, make等词后面,可以直接跟动词原形

call sb to do 叫某人做某事 双语对照 例句:1.How long does it take sb to do sth? 某人花费多长时间做某事?2.It seems senseless for sb. To do sth. 对于某人来说做某事是愚蠢的.

call on与call at都表示＂拜访＂,两者区别在于后面所接宾语的不同.call on后面接somebody,而call at后面接some place. a. i called on him yesterday.我昨天拜访了他. b.i called at his house yesterday.我昨天拜访了他家. 此外,call on/upon还可以表示＂号召＂,构成词组call on/upon somebody to do something ＂号召某人做某事＂. we are called on to make some personal decisions every day.每天我们被号召去做一些个人决定.

是个句式罢了,call on sb to do的意思是号召某人做某事

call sb.给某人打电话call sb. up给某人打电话give sb. a call给某人打电话

有的: call somebody to do something = 找某人做某某John called to help him with his English.

call in sb. to do sth.