to be
US /tə biː/
UK /tə biː/
助动词
1.
是, 存在
to exist or happen
示例:
•
I want to be happy.
我想要快乐。
•
The meeting is to be held tomorrow.
会议将于明天举行。
2.
是, 正在
used as an auxiliary verb to form tenses, moods, and voices
示例:
•
She is reading a book.
她正在看书。
•
They were playing soccer.
他们正在踢足球。
动词
是, 成为
used to indicate identity or a characteristic
示例:
•
She wants to be a doctor.
她想成为一名医生。
•
He seems to be tired.
他似乎很累。