11. Present perfect tense
When a tense is used to show that an action has just
been completed or an action has finished at the
moment of speaking. It known as the present perfect
12. Present Perfect Continuous tense
When a tense is used to show that an action
has been taking place since a point of time in
the past and in progress up to now it is known
as present perfect continuous tense.
13. Types of past tense
• Simple past tense.
• Past continuous tense.
• Past perfect tense.
• Past perfect continuous tense.