be

v.aux.

1. （與動詞的現在分詞連用，構成各種進行時態）正在……，在……
   I won't be free this afternoon. I'll be seeing a friend off.

   我今天下午沒空，我要給朋友送行。

   What were you doing from 9 to 11 this morning?

   今天上午九點到十一點你在做什麼？

   He is working.

   他在工作。

2. （與及物動詞的過去分詞連用，構成被動語態）被……
   The problem was solved long ago.

   問題早解決了。

   It will be discussed tomorrow.

   此事將在明天討論。

3. 【舊】（與不及物動詞go, come, rise等的過去分詞連用，構成完成時）已經……
   The sun is set.

   太陽已經下山。

4. （與動詞不定詞連用，表示職責，義務，意圖，約定，可能性等）應該做……，必須做……；預定做……；會做……
   The President is to visit Japan next week.

   總統將於下週訪問日本。

   You're to do your homework before you watch TV.

   你應該做了功課再看電視。

vi.

1. 是[L]
   At that time he was the chair of the department.

   當時他是系主任。

   I am a teacher and they are my students.

   我是老師，他們是我的學生。

   She is very young.

   她非常年輕。

2. （表示時間，度，量，價值等）是；值；等於[L]
   The watch is 100 dollars.

   這表值一百元。

3. （常用命令語氣或不定詞）要，得；成為；變成[L]
   Be quiet, please.

   請安靜。

4. （與there連用）有[L]
   There are a lot of tourists there.

   那裡有許多觀光客。

5. 逗留，（繼續）待[L]
   He will be here all next week.

   下週他將一直待在這兒。

6. 在[Q]
   Tony is in the office.

   湯尼在辦公室裡。

7. 存在
   Whatever is has every reason for being.

   存在的東西總有其存在的理由。

8. 聽任
   If she's sleeping, let her be.

   如果她在睡覺，就別驚動她。