why are you use be example be able

you should be good .

Be is almost always used to indicate the past, although the infinitive form is “to be”. There is no “be’s” in English, as in, “I be’s a good student”. When used with “will” or “hope to”, however, it can be used to indicate the future. “I hope to be a pilot” or “I will be waiting for you.”

when use be

be is a verb mean "होना" you should be able to speak in english. you should be there on time.