動(dòng)詞 be:

1. have the quality of being; (copula, used with an adjective or a predicate noun)
   同義詞：be
2. be identical to; be someone or something
   同義詞：be
3. occupy a certain position or area; be somewhere
   同義詞：be
4. have an existence, be extant
   同義詞：exist, be
5. happen, occur, take place
   同義詞：be
6. be identical or equivalent to
   同義詞：equal, be
7. form or compose
   同義詞：constitute, represent, make up, comprise, be
8. work in a specific place, with a specific subject, or in a specific function
   同義詞：be, follow
9. represent, as of a character on stage
   同義詞：embody, be, personify
10. spend or use time
    同義詞：be
11. have life, be alive
    同義詞：be, live
12. to remain unmolested, undisturbed, or uninterrupted -- used only in infinitive form
    同義詞：be
13. be priced at
    同義詞：cost, be

1. Spain is our favorite holiday spot.
   西班牙是我們喜歡的度假地點(diǎn)。
2. The boy is 150 centimeters tall.
   這個(gè)男孩有150厘米高。
3. There is no doubt about it.
   那是毫無疑問的。
4. The room is 15 feet in length and 10 feet in breadth.
   這房間長15英尺，寬10英尺。
5. That's the way it is.
   就是這么回事。
6. The video is programmed to switch on at ten o'clock.
   電視機(jī)設(shè)定在10點(diǎn)鐘自動(dòng)打開。
7. A friend in need is a friend indeed.
   患難之交才是真朋友。
8. Pain past is pleasure.
   過去的痛苦即是快樂。

is

v.（動(dòng)詞）
Third person singular present indicative of be
be的第三人稱單數(shù)現(xiàn)在陳述語氣詞

來源：
Middle English
中古英語
from Old English * see es-
源自 古英語 *參見 es-