1）I think he will be back in a week．
2）He said he would call on you in a week．
after1）用於將來時，後接時間的一點。例：
①He will come back after ten o’clock．
②I’ll meet you after school today．
2）用於過去時，後既可接時間的一點也可接時間的一段。例：
①He went to Shanxi two weeks ago，and came back after a week．兩週前他去了山西，一週後他回來了。
②After liberation，he died of illness．解放後，他病故了
①代詞it代替上文提到的單數同一事物，可數名詞（例句1））和不可數名詞（例句2））都可指。例：
1）I saw a new film yesterday．It’s very instructive．
2）Oceania is a separate landmass，but it is separated from Asia byvery shallow water．
②代詞one（s）用來代替同類事物，不一定是同一物，多有前置定語（如例1，3，5）或後置定語（如例4），one代替單數名詞（如1，2，4），表示泛指，the one（s）則表示特指（例4，5）。例如：
1）It was exactly like your necklace but it was a different one．
2）You have no watch now，so I think you’d better get one．
3）Will you please pass me some apples？I’d like big ones．
4）Is this university the one they visited last spring？
5）However，new shoots of bamboo will come up from around theroots of the old ones．
③代詞that可用來代替前面提到的單數，可數或不可數名詞（例1，2）。但這一名詞在第一次出現時須有後置定語，以區別於第二次所指之物。當前面提到的是複數名詞，則後面要用those代替（例3）。例如：
1）Tom’s textbook is not so new as that of Rose．
2）It was said that the grain output of 1996 was double that of1994．
3）The lights in your classroom are much brighter than those inours．
by sea/by water/by land/by air/by bike/by spaceship
on horseback on（by）the 9 o’clock train．我將乘九點鐘的火車去。
on their bikes on（in） a plane
on在上面，如馬和自行車，in 在裏面，如飛機，火車
I have two friends．One is a teacher and the other is adoctor．
They have four children．One is a girl，the others areboys
I don’t like this pair of shoes．Would you please showme another pair？
Many people are standing there．Some are workers；others are peasants
some time，sometime，some times和 sometimes是常用的幾個詞，它們形似而含義不同。請記住下面口訣：
分開是“一段”， 相連爲“某時”。分開s是“倍、次”， 相連s是“有時”。
讀讀下面四句話， 便會運用這四個詞。例如：
（1）I’ll stay here for some time．我將在這兒呆一段時間。
（2）Kate will be back sometime in February．凱特將在2月某個時候回來。
（3）Our school is some times larger than theirs．我們學校比他們學校大幾倍。
（4）Joan goes to school on foot，but sometimes by bike．瓊步行上學，但有時也騎自行車去。
so與such都表示“如此的”，“這麼，這樣”，so用來修飾形容詞和副詞；而such常用作形容詞，用來修飾名詞。
該用哪一個冠詞，首先要問三個“W”的問題，也就是Which…？ What…？Whose…？
如果答得出來，就用定冠詞“the”.如果答不出來，並且這個普通名詞是單數可數名詞，就用不定冠詞“a”
1）Japan is in the east of Asia．
2）Japan is to the east of China．
3）Korea（朝鮮）is on the northeast of China．
“上”和“下”：向（江河）上游用up；向下遊用down “北”和“南”：向北用up；向南用down。
“城”和“鄉”：向城市用up，向農村或小鎮用down。
“來”和“去”：沿着大道來用up，沿着小街走去用down。 “入”和“出”：入校用up，離校down