1 现在进行时<i am doing >

I/He/She/ + am/is/are + doing

表示正在做某事

i am working

表示某事已 经开始做，但尚未完成

kate wants to work Italy,so she is learning Italian.(但是说话的当时可能并没有在学意大利语)

表示这一阶段正在发生的动作或者行为

A : You are working hard today
B: Yes ,i have a lot to do .

表示一段时间内正在发生的变化

At first ,i donot like my job ,but i am begining to enjoy it now .
Is your English getting better?

2 一般现在时 < i do >

现在的情况或者状态，表示一直发生的动作或者行为

Nurses look after patient in hospitals.

经常发生的动作或者行为

I usually go away at weekends.

表示普遍的真理，动作是否发生在说话时并不重要

The earth goes round the sun.

有些行为是靠说话完成的，如 I promise ...做承诺，I suggest ...

I promise i will not be late .
What do you suggest I do ? I suggest that you ...

疑问句和否定句 借用‘do ，does’构成

What do you do ?
He doesn't do anything to help .