English Present Perfect Tense
Overview
This module introduces the present perfect tense, which consists of a helping verb and a past participle.

To form the Present Perfect 1 we use “to have” + a verb in the past participle. In some cases. the simple present form and the past participle form are the same. These are regular verbs.
Examples:
clean – cleaned (simple) – cleaned (participle)
play – played – played (participle)
In some cases, the past participle form of a verb is different from the simple past form. These are irregular.
Examples:
drive – drove (simple) – driven (participle)
send – sent (simple) – sent (participle)
fly – flew (simple) – flown (participle)
The same rules apply when formulating questions:
Examples:
Have you fallen?
Has she forgotten?
Have I mentioned?
Have we thought about it?
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Additional Topics

This unit covers subordinating conjunctions, including after, although, because, before, if, and since. These occur at the beginning of subordinate or dependent clauses, and are used to combine independent and dependent clauses together.
Common European Framework of Reference for Languages
The CEFR is an international standard used to describe language ability. Here are specific details of the CEFR for this topic.