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Past tense refers to situations that have already happened. Verbs that are written in past tense often end in –ed like showed and laughed, although there are verbs that are classified as irregular like ran or sang that are past tense but do not end in –ed. Past tense verbs are also created when a verb is combined with a helping verb like were, was, has, have, had, or did.
Examples: He showed her his schedule. / He has shown her his schedule.
Present tense refers to situations that are happening right now. These may be verbs that end in an –s or an –ing. They may also include a helping verb like "to be" verbs such as is and are.
Examples: He shows her his schedule. / He is showing her his schedule.
Future tense refers to situations that will happen sometime in the future. These often use the helping verb will or the verb phrase is going to (verb) or are going to (verb).
Examples: He will show her his schedule. / He is going to show her his schedule.
Explanation:
Source: content.nroc.org
Hope it helps.