1.句子主干是“我們走回家”椿访，兩個句子是因果關(guān)系乌企。半小時過去了所以用過去式。句子中要用到go by成玫，半小時過去了應(yīng)翻譯成half an hour gone by
Half an hour gone by加酵，but the last bus had not come so we had to go home on foot.
2.句子主干是“瑪麗對漢語考試很擔(dān)心”，兩個句子是因果關(guān)系用連詞because連接兩個句子哭当，時態(tài)用一般現(xiàn)在時猪腕，看上去用look，背熟課文用learn the text by heart
Mary looks very worried about the Chinese exam because she has not learned the text by heart.
3.句子主干是“我們?nèi)⒂^博物館”荣病，前后是因果關(guān)系码撰，since引導(dǎo)原因狀語從句，在這里是既然的意思个盆，主句用一般現(xiàn)在時脖岛，從句現(xiàn)在完成時朵栖，推遲用“postpone”。
Since the basketball match has been postponed we may as wall visit the museum.
4.句子主干是“他住在澳大利亞”柴梆，動作已經(jīng)完成陨溅，用現(xiàn)在完成時，一直用“all the way”時間放在句前绍在，地點(diǎn)放在句末门扇。
Entire world war II period he has been living with his parents all the way in Australia.
5.句子主干是“我與我的大學(xué)同學(xué)失去了聯(lián)系”，since引導(dǎo)時間狀語從句偿渡，主句用現(xiàn)在完成時臼寄，從句用一般過去時，失去聯(lián)系用lose touch? 可以說用kind of
Since I graduated from Nanjing university in 1985溜宽，I have kind of lost touch with my classmates.
