Don't cry, you are a big boy now.
These people who were young fifty years back are now gray haired.
Dark clouds are a sign of rain or snow.
There are 300 students or so in this middle school.
Love and hate are extremes.
There are more than 5,000 adjectives in that dictionary.
You are just saying that.
Who do you think you are?
a unit of surface area equal to 100 square meters
have the quality of being; (copula, used with an adjective or a predicate noun)
be identical to; be someone or something
occupy a certain position or area; be somewhere
have an existence, be extant
happen, occur, take place
be identical or equivalent to
form or compose
同义词：constitute, represent, make up, comprise, be
work in a specific place, with a specific subject, or in a specific function
represent, as of a character on stage
同义词：embody, be, personify
spend or use time
have life, be alive
to remain unmolested, undisturbed, or uninterrupted -- used only in infinitive form
be priced at