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肯定句：

口诀：我和你都用have，has用于他、她、它，所有复数都用have。

第一人称：I have…

第二人称：You have…

第三人称：He/She/It/Jim has…

复数：They/The girls/The boys/The children/Jim and Tom have…

否定句：

第一人称：I don't have…

第二人称：You don't have…

第三人称：He/She/It/Jim doesn't have…

复数：They/The girls/The boys/The children/Jim and Tom don't have…

疑问句：

第一人称：DoI/we have…

第二人称：Doyou have…

第三人称：Dothey have…

Doeshe/she/it have…

1.在肯定句中，当主语为第三人称单数，或单数可数名词时，have要变成相应的单数形式has.主语为其他人称和数时，则用have.

① I have a cat.(我有一只猫。)

② You have a farm.(你有一个农场。)

③ They have pears.(他们都有梨子。)

④ It hasa long tail.(它有一根长尾巴。)

⑤ She hastwo big eyes.(她有一双大眼睛。)

⑥ He hasa cat.(他有一只猫。)

⑦ Tom hasa sister.(汤姆有一个姐姐。)

2.实义动词have(有)的一般现在时的肯定句在变为否定句时，要借助助动词do和does，且have要用原形。如果主语是第三人称单数，助动词要用does，当主语是其他人称时助动词用do.

① I have a cat. / I don'thave a cat.

② You have a farm. / You don't have a farm.

③ They have pears. / They don'thave pears.

④ It has a long tail. / It doesn'thavea long tail.

⑤ She has two big eyes. / She doesn't havetwo big eyes.

⑥ He has a cat. / He doesn't havea cat.

⑦ Tom has a sister. / Tom doesn't havea sister.

3.在进行疑问句转换时，要借助助动词do/does.在句首用do/does，同时将has还原成have.

肯定句用“Yes，主语+do/does.”回答。

否定句用“No，主语+don't/doesn't.”回答。

① You have a farm.

→ Do you have a farm?

→ Yes，I do. / No，I don't.

② They have pears.

→ Do they have pears. ?

→ Yes，they do. / No，they don't.

③ It has a long tail.

→ Does ithave a long tail?

→ Yes，it does. / No，it doesn't.

④ She has two big eyes.

→ Does she havetwo big eyes?

→ Yes，she does. / No，she doesn't.

⑤ He has a cat.

→ Does he havea cat?

→ Yes，he does. / No，he doesn't.

⑥ Tom has a sister.

→ Does Tom havea sister?

→ Yes，he does. / No，he doesn't.

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