Third Person Singular 第三人称单数

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Third Person Singular
Compared to other languages (like French, for example) conjugation in English is very regular. If we conjugate a verb in any tense, the verb will stay the same in all persons. The only exception is the third person singular and a couple of verbs.
In this article, we'll talk about forming the third person singular.
The third person singular is most often expressed by words such as he, she and it. But, in fact, any person, place, or thing in the singular form (for example house, dog or keyboard) other than the speaker and the addressee is referred to in the third person singular.
FormingThe basic rule of conjugating the third person singular is adding -s to the base form of a verb.
a) All verbs ended in -y and a vowel before it, get -s.
Examples:
Eat

• I eat
• you eat
• he eats
• she eats
• it eats
• we eat
• you eat
• they eat
  

Make

• I make
• you make
• he makes
• she makes
• it makes
• we make
• you make
• they make
  

Buy and pay

• buy - buys
• pay - pays
  

b) Verbs ended in -ch, -sh, -ss, -x, -o get -es.

• kiss - kisses
• watch - watches
• push - pushes
• fix - fixes
• go - goes
• do - does
  

c) Verbs ended with -y and a consonant before it, get -ies.

• cry - cries
• try - tries
• marry - marries
  

Exceptions

• The verb "to be"
• The  verb "to have"
  

Examples
	She has 4 pets.
	Mike has a new job.
	He has a very good understanding of the tenses.
	He is twelve years old.
	My house is very small.

• modal verbs (such as should, may).