1.today一般现在时;now现在进行时;tomorrow和soon一般将来时
2.这个问题我不是很明白你在问什么
3.频率副词很多,比如always总是;usually经常;often时常;sometimes有时;never从不,等等.但不一定都只用在一般现在时当中,比如:He will always be my best friend.他将永远是我最好的朋友.这个是一般将来时.When he was five years' old,he never thought he would be such a great person.当他还是五岁的时候,他从未想过他会成为这么厉害的人.这个是一般过去时.
4.频率副词一般情况下放在否定词后面,比如:His lunch is not always rice.他的午餐不总是米饭.
5.这个问题问的很奇怪,We are at the same age.我们俩同岁.
He is two years elder than me.他比我大两岁.
His age is two years elder than mine.他比我大两岁.
6.medicine是个药品概念,一般做单数对待.Take some medicine吃些药.
回答很详细了,希望能采纳.