1
It is when the verb doesn't have a direct object who recives the action.
2
It is when the verb has a direct object who recives the action.
3
They help to form the various tenses.
4
They are verbs which their writing is modified, when they are in past and in past participle
5
They are verbs that change adding -ed, when they are in past and past participle.
6
It is a type of auxiliary verb that is used to express ability, possibility, permission or obligation.
7
It is an action, state of being or natural phenomena.
