Both of the girls are ...
結構︰Both/Three/Some/Many/All of the+複數名詞+複數動詞+。
說明︰此句型意為其中兩個。both，three，some，many，all都是不定代名詞;若跟隨 of 表示限定範圍的為複數代名詞，則代名詞前不加 the。該結構中動詞須用複數。
Both of the girls are nice. 這兩位女生是好的。
Many of the supermarkets are having sales1. 不少這些超級市場正在舉行拍賣。
Three of the students came2 here yesterday. 這些學生中有三位昨天來這裡。
... who ...
結構︰主詞+關係代名詞+動詞+。
說明︰who 是主格關係代名詞，引導形容詞子句，前面的先行詞接人，後面接動詞，必須和先行詞维持一致。who 可用 that 代替。
The man who called was3 tired. 打電話的那個男性是疲倦的。
The boy who is speaking to Helen enjoys playing soccer.
正在跟海倫談話的那男生喜愛踢球。
People who use their free4 time well are usually healthy and happy.
善於借助空閒時間的人一般健康又快樂。
... which ...
結構︰主詞+動詞+名詞+關係代名詞+動詞。
說明︰which 可作主格或受格關係代名詞，引導形容詞子句，前面的先行詞接動物或事物，後面接動詞，必須和先行詞维持一致。
Here is a book, which is very interesting. 這裡有一本很有趣的書。
I like to watch TV programs5 which are about sports.我喜歡觀賞有關運動的電視節目。
They want to sell the house, which has only one door.他們想賣掉那幢只有一扇門的房屋。
... by oneself6 ...
結構︰主詞+動詞+by oneself。
說明︰此句型意為某人自己。反身代名詞的人稱、數和性別，須和相關的主詞一致。
They went to Suao by themselves7. 他們自己去蘇澳。
John fixed8 the tape recorder by himself9. 約翰靠他一个人维修錄音機。
You cant go mountain climbing by yourself10. 你不可以自己去登山。
