Simple present
I study English everyday.
Present continuous [am / is / are] + [verb + ing]
I am studying English now.
Present perfect [has /have] + [past participle]
I have studied English in several Canadian cities.
Present perfect continuous [has/have] + [been] + [verb + ing]
I have been studying English for two years.
Verbals
Participle or verbal adjectives are words with a value of an adjective and a verb.
Gerunds or verbal nouns have the value of a noun and a verb.
They usually end with the "ing" ending.
Infinitives act like gerunds .
They have the value of a noun and a verb. Verb forms "to see, to study" are infinitives, can be a subject of a verb, object of a verb, or a subjective completion, take an object or have an adverbial modifier.
Modal Verbs are irregular verbs which behave very differently from normal verbs.
Here are some important differences:
1. Modal Verbs do not take "-s" in the third person.
2. You use "not" to make Modal Verbs negative, even in Simple Present and Simple Past.
3. Many Modal Verbs cannot be used in the past or future tenses.
