This document discusses different tenses in English:
- The simple present tense is used to describe habitual activities. It uses verbs without suffixes.
- The simple past tense uses verbs with suffixes like -ed to talk about activities that happened in the past. Adverbs of time are used to indicate when.
- The future tense uses the modal verb "will" along with verbs to talk about activities that will happen in the future. Adverbs of time are also used to discuss future events.