3rd person Present Simple Tense

Normally in the present tense we add S to the end of the verb in the 3rd person (He, She, It).

- He speaks three languages.
- She drinks coffee every morning.
- My dog hates my cat.

Irregular Verbs

Irregular verbs in English in the present tense follow very simple rules. The only change that is made to these verbs is in the third person – for He, She or It.

1. If the verb ends in SS, X, CH, SH or the letter O, we add + ES in the third person.

- A mechanic fixes cars.
- She watches TV every afternoon.
- He kisses his wife before he goes to work.

2. If the verb ends in a Consonant + Y, we remove the Y and + IES in the third person.

- Isabel studies every night.
- The baby cries all the time.
- He denies all responsibility.


Negative Sentence 

To form the negative we use the auxiliary do not. Again, the only variation occurs in the 3rd person where we use does not.
In the negative, the main verb is always in the bare infinitive (without TO). It doesn't change for the third person. We don't put an S on the end of the verb in the negative form. In the examples above - talk, sleep and study do not change in the 3rd person.

- He speaks Italian
- He doesn't speak Italian.

Remember!: Do not can be abbreviated to Don't and Does not can be abbreviated to Doesn't.

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