be a member of / be in ...延續性動詞又名持續性動詞，它表示能夠延續的動作，這種動作可以長時間延續下去或產生持久的影響。動詞按其動作發生的方式、動作發生過程的長短，可分為延續性動詞和終止性動詞。

join相關例句

It costs ￡ 20 to join.

需交20英鎊才可參加。

People of various party allegiances joined the campaign.

各個不同政黨的擁護者都參加了這次活動。

Join a social club to make new friends.

加入一個社交俱樂部，好交一些新朋友。

We'll join up with the other groups later.

我們以后再與其他小組會合。

Over the past year, the company has joined the big league.

去年一年中，公司已躋身一流之列。

延續性動詞

延續性動詞能夠延續的動作。如：study, work, stand, lie, know, walk, keep, live,have, wait, watch, sing, read, sleep,stay等。

1、 He worked all day in the laboratory. 他在實驗室干了一天。

2、I waited for you for more than half an hour. 我等你等了半個多小時了。

表示時間段的短語有:for+ 時間,for 2 years; since從句,since he came here; since+時間點名詞,since last year, since 5 days ago; how long; for a long time等。