一般现在时表示习惯性动作, 真理, 是过去、现在和未来都会发生的事情。一般现在时一般与频率副词often，always，sometimes，never，frequently，rarely，ever等连用。Helen never writes to her brother Tony. She sometimes rings him.频率副词往往放在句子中的实义动词前, 非实义动词后；如果既有实义动词又有非实义动词, 要放在两个之间；疑问句中副词往往放在主语后面。在否定句中not必须放在always之前，而且也出现在generally、normally、often、regularly和usually之前；not必须出现在sometimes和frequently之后。表示肯定的速记可以用在句尾；在特别强调和需要对比时，frequently、generally、normally、sometimes、usually等副词可用于句首。I get paid on Friday usually. very often the phone rings when I’m in bath.非实义动词 :① 系动词(be) ② 帮助动词构成时态的助动词③ 情态动词(must, can, may) 除此外皆实义动词.I frequently go to bed hungry. （形容词作状语）He went to school hungry.饿着肚子上学.You must come here hungry.空腹来这里.