1. Classification
1.1. Action Verbs
1.1.1. V_infinitive
1.1.2. V_ing
1.1.3. V_past
1.1.4. P_II
1.2. Auxiliary Verbs
1.2.1. To be
1.2.1.1. is/are/am
1.2.1.2. was/were
1.2.2. Have
1.2.2.1. have/has/had
1.2.3. Do
1.2.3.1. do/does/did
1.3. Modal Verbs
1.3.1. can/could
1.3.2. may/might
1.3.3. will
1.3.4. shall/should
1.3.5. have to
1.3.6. ought to
1.4. Linking verb
1.4.1. tobe
1.4.2. become
1.4.3. get
1.4.4. grow
1.4.5. seem
1.4.6. feel
1.4.7. look
2. Tenses of verb
2.1. Simple Tenses
2.1.1. Future
2.1.1.1. Predict future events
2.1.1.2. A decision at the moment of speaking
2.1.1.3. Make an invitation, request, promise, warning, offer help
2.1.2. Past
2.1.2.1. Past actions
2.1.2.2. Past habits
2.1.3. Present
2.1.3.1. present habits, repetitive events
2.1.3.2. The obvious truth, the truth
2.2. Continous Tenses
2.2.1. Past
2.2.1.1. Actions happening at a specific moment in the past
2.2.1.2. Two simultaneous past actions
2.2.1.3. Interrupted past actions
2.2.2. Present
2.2.2.1. Actions happening now
2.2.2.2. Temporary actions
2.2.2.3. Future arrangements
2.2.2.4. Trends and changes
2.2.3. Future
2.2.3.1. Actions in progress at a specific future time:
2.2.3.2. Polite inquiries about someone’s plans
2.2.3.3. Future actions happening alongside others
2.3. Perfect Tenses
2.3.1. Past
2.3.1.1. Actions completed before another past action
2.3.1.2. Showing cause and effect
2.3.1.3. Reported speech
2.3.2. Present
2.3.2.1. Completed actions with relevance to the present
2.3.2.2. Actions that started in the past and continue to the present
2.3.2.3. Life experiences
2.3.2.4. Recent actions with "just," "already," or "yet"
2.3.3. Future
2.3.3.1. Actions completed before a specific future time
2.3.3.2. Future actions that will have occurred before another future event
2.3.3.3. Predictions about completed actions
2.4. Perfect Continuous Tenses
2.4.1. Present
2.4.1.1. Actions that started in the past and are still ongoing
2.4.1.2. Emphasizing the activity's duration
2.4.1.3. Recent actions with present results
2.4.2. Past
2.4.2.1. Actions that were ongoing before another past action
2.4.2.2. Emphasizing duration before a past event
2.4.2.3. Cause of a past situation
2.4.3. Future
2.4.3.1. Actions that will be ongoing up to a specific future time
2.4.3.2. Emphasizing duration before another future action
2.4.3.3. Predicting the future result of an ongoing action