①表示地點，時間，方向等的介詞短語放在句首時的全部倒裝 .

In front of the house stopped apolice car. 一輛警車停在房子前面 .

Under the tree sat a boy，一個男孩兒坐在樹下

②表示否定含義的介詞短語置於句首時，如：in no way, by no means, in no case, in no time, on no condition, at no time, on no account, under no circumstances等。

如：In no case are you to leave your post

.又如：“only + 介賓”放在句首時：

Only by working hard can you succeed.

③全部倒裝

表示地點、方位等的介詞短語置於句首，且句子主語是名詞（短語），謂語是be/lie/stand/sit等不及物動詞時

如：In the front of the classroom stood my English teacher.

On the east of Hunan lies Jiangxi.

①on foot. 走路

如： I go to school on foot.我走路上學。

②on business. 出差

He's away on business.他出差去了。

③on the basis of. 在…基礎上

Statement should be madeon the basis offact.

說話要有根據。

④ on the point of. 正要…的時候；在…之際

We were on the point of giving up.我們當時幾乎要放棄了。

⑤on the whole.總體上

Our opinions areon the wholethe same.

我們的意見基本上是一樣的。

⑥on　sale.出售,廉價出售

Are the erasers on sale?這些橡皮在出售嗎？

⑦on　time.準時

The bus came righton time.公共汽車正好準時到達。