I have to go home at 4 o'clock in the afternoon.
本句可以看出有兩個(gè)固定結(jié)構(gòu):have to(必須) 和in the afternoon(在下午).
有時(shí)間4 o'clock,介詞at一般跟具體時(shí)刻連用,所以是 at 4 o'clock.
主語為I,放在句首,句意為:我必須在下午四點(diǎn)回家。
故答案為:
I have to go home at 4 o'clock in the afternoon.