With past tense verbs, the formation of the verb is the same for all subjects. But in the present tense, the first word of the verb changes for 3rd person singular (Lesson 2). However, the verb be is different.
She likes hot weather.
This heater uses gas.
The game has finished.
Does he play tennis?
All other persons -- use base form (Lesson 14):
I like hot weather.
These heaters use gas.
The games have finished.
Do you play tennis?
NOTICE: Only the first word of the verb changes.
The game has finished. (NOT has finisheds)
Does he play tennis? (NOT does he plays )
NOTICE: Modal verbs (Lesson 27) do not have an s form.
He will come. (NOT wills come )
We use the past form (Lesson 14) for all persons.
1ST PERSON SINGULAR:Present: I am tired.
3RD PERSON SINGULAR:
Present: Maria is tired.
Past: Maria was tired.
Present: She is going home.
Past: She was going home.
ALL OTHER PERSONS:
Present: You are tired.
Past: You were tired.
Present: We are going home.
Past: We were going home.
Present: They are sleeping.
Past: They were sleeping.
NOTICE: The other forms of be (be, been, being - Lesson 16) are the same for all persons.