英语时态讲解
1 be动词用am/is/are表示,之后接名词,形容词或介词。often; usually; every…; sometimes; always; never; once/twice/… a week/month/year; on Sundays/Mondays/….;
1 be动词用am/is/are表示,之后接名词,形容词或介词。often; usually; every…; sometimes; always; never; once/twice/… a week/month/year; on Sundays/Mondays/….;