去年秋天用英语这样说：Last fall。
autumn：名词：秋季；秋天；秋。
fall：动词：落下；掉落；跌落；跌倒；摔倒；减少；下降；减弱；沦陷；被攻陷。
1999年秋天。in the autumn of 1999.
秋天的初霜。first frost of autumn.
凉爽的秋天。pleasantly cool autumn (days).
秋天的金色。the golds of autumn.
即将来临的秋天。coming autumn.
fall behind.拖后。
fall into.落入；跌入；陷入。
fall in love with.爱上…
fall asleep.入睡；睡着了。
fall out of.从...中掉出来；放弃...；从...中落下。
fall down.有不足；有欠缺；失败。
rise and fall.兴衰；起伏；（价格等的）涨落。
fall off.脱落，掉，掉落。
fall out.脱落；闹翻；掉队；发生，结果。
fall under.倒在...下；归入...类；属于。
fall by the wayside.半途而废，中辍。
双语例句：
1、去年秋天一本修订的课本匆匆出版了。
A rewritten textbook was rushed out last autumn.
2、去年秋天，他离开了这家公司，并得到了80万英镑的补偿金。
He left the company with an ￡800,000 pay-off last autumn.
3、去年秋天我们去了德国。
Last autumn we went to Germany.
4、去年秋天，我在西德克买了一套新公寓，在新年前夕搬进去。
Last autumn I bought a new flat in Siedke which I moved into just before New Year's Eve.
5、去年秋天，她被北京大学录取了。
Beijing University accepted her last fall.
6、去年秋天他们在建一家工厂。
They were building a factory last autumn .
7、您女儿比我去年秋天看到她时长高了。
Your daughter is taller than when I saw her last fall.