what is a past tense and future tense verb

A past tense verb expresses action that happened in the past.

Examples:

Last week we studied the French Revolution.
Yesterday it rained hard all day.

A future tense verb expresses action that will happen in the future.

Examples:

Next we will study the Industrial Revolution.

We expect that it will rain tomorrow.

http://leo.stcloudstate.edu/grammar/tenses.html

He had come downstairs to find her already gone

A verb is a word that describes an action, occurrence, or state of being. Verbs can be used in different tenses to indicate when an action happened or will happen. Two common tenses are past tense and future tense.

1. Past tense verbs: These verbs are used to describe an action that has already happened or was completed in the past. They indicate that the action occurred before the present moment. For example:
- Past tense of "eat" is "ate": He ate an apple yesterday.
- Past tense of "jump" is "jumped": She jumped over the puddle.

To identify a past tense verb, look for certain verb endings, such as "-ed" or "-d" in regular verbs. However, irregular verbs do not follow this pattern and might change in spelling when forming past tense.

2. Future tense verbs: These verbs are used to describe an action that will happen in the future or is expected to happen. They indicate that the action occurs later than the present moment. For example:
- Future tense of "go" is "will go": I will go to the park tomorrow.
- Future tense of "finish" is "will finish": They will finish the project next week.

To form a future tense verb, we typically use the auxiliary verb "will" before the base form of the verb. However, other structures like "be going to" can also be used to talk about future actions.

Keep in mind that verb tenses may vary depending on the language you are studying, and English verbs have more tenses beyond past and future. It's always helpful to consult grammar resources or reference materials specific to the language you are learning to get a comprehensive understanding.