1. Figure out when each tense is used, such as the present continuous tense to express the current action. The past continuous tense expresses actions that were ongoing in the past.
2. Find out the rules of change of predicate verbs. For example, in the present continuous tense, the singular form of the verb be is is and the plural form are are. In the past continuous tense, the singular form was was and the plural form were were.
3. Look at the structure of each situation. For example, the present continuous tense is be+doing, and the general tense is will+do
4. The rest is to remember carefully Yes, memorize more!