Verbs simple aspect Continuous(progressive) aspect Perfect and Perfect Continuous aspect

Simple and continuous aspects. Verbs forms can use either the simple aspect or the continuous aspect. The infinitive can also be used in the simple or continuous aspect:
That child is too young to play with matches.
{infinitive with to)
That child is too young to be playing with matches.
(continuous infinitive with to)
You shouldn’t work so hard.
(modal + infinitive)
You shouldn’t be working so hard.
(modal + continuous infinitive)
The simple aspect. When we use the simple aspect, we view the action or series of actions as a whole. The simple aspect indicates one or both of the following:
an action or series of actions is complete.
that the situation is permanent or is regarded as permanent.
We can use both dynamic and stative verbs in the simple aspect. Dynamic verbs are verbs which describe actions, e.g. go, ask, walk, explain, work.
Stative verbs are verbs which do not describe actions: they describe feelings, thoughts, wishes, the senses and states of being, e.g. believe, belong, know, smell, understand, want.
The continuous (or progressive) aspect. When we use the continuous aspect, we view the action or series of actions in progress. The continuous aspect does not describe the whole event. The continuous aspect indicates one or more of the following:
- the action or series of actions are in progress.
We view the action at some point between its beginning and its end.
-that the action is not complete.
-that the situation is temporary.
When we use the continuous aspect, we describe an activity in progress. We therefore use the continuous aspect with dynamic verbs but not with stative verbs.