Verb tenses come in six different forms that indicate the time when something happens. An action can be in the present, past or future.

• Simple present
• Present perfect
• Simple past
• Past perfect
• Future
• Future perfect

In addition, verb forms can take a perfect construction, with either present perfect (the word has plus the past tense of the verb form); past perfect (the word had plus the past tense of the verb form); or future perfect (the word will have plus the past tense of the verb form).