一般现在时讲解

一般现在时讲解

EnglishTenseExplanation

SimplePresentTense

Use"do"or"does"

Example:Idomyhomeworkeveryday.Shedoesherhomeworkeveryday.

PresentPerfectTense

Use"havedone"or"hasdone"

Example:Ihavedonemyhomework.Shehasdoneherhomework.

PastPerfectTense

Use"haddone"

Example:Ihaddonemyhomeworkbeforetheparty.Shehaddoneherhomeworkbeforetheparty.

PresentContinuousTense

Use"is/aredoing"

Example:Iamdoingmyhomeworkrightnow.Sheisdoingherhomeworkrightnow.

PastContinuousTense

Use"was/weredoing"

Example:Iwasdoingmyhomeworkwhenshecalled.ShewasdoingherhomeworkwhenIcalled.

PresentPerfectContinuousTense

Use"have/hasbeendoing"

Example:Ihavebeendoingmyhomeworkfortwohours.Shehasbeendoingherhomeworkfortwohours.

PastPerfectContinuousTense

Use"hadbeendoing"

Example:Ihadbeendoingmyhomeworkforthreehourswhenshearrived.ShehadbeendoingherhomeworkforthreehourswhenIarrived.

FuturePerfectContinuousTense

Use"willhavebeendoing"

Example:Iwillhavebeendoingmyhomeworkforfourhoursbythetimeshegetshome.ShewillhavebeendoingherhomeworkforfourhoursbythetimeIgethome.

SimplePastTense

Use"did"

Example:Ididmyhomeworkyesterday.Shedidherhomeworkyesterday.

SimpleFutureTense

Use"willdo"

Example:Iwilldomyhomeworktomorrow.Shewilldoherhomeworktomorrow.

ThirdPersonSingularForm

Whenthesubjectisthirdpersonsingular,theverbneedstoadd"-s"or"-es".

Rules:

Add"-s"totheendoftheverb,pronouncedas/s/afteravoicelessconsonant,/z/afteravoicedconsonant;pronouncedas/ts/after"t",pronouncedas/dz/after"d".

Forverbsendingin"s","x","ch","sh",or"o",add"-es",pronouncedas/iz/.Iftheverbalreadyendswithan"e",justadd"-s".

Examples:

play-plays

leave-leaves

swim-swims

pass-passes

fix-fixes

teach-teaches

wish-wishes

do-does

study-studies

carry-carries

fly-flies

Forverbsendinginconsonant+"y",changethe"y"to"i"andadd"-es",pronouncedas/z/.

Example:cry-cries,study-studies

Note:Thethirdpersonsingularformof"have"is"has".

Exercise:Writethethirdpersonsingularformofthefollowingverbs.

1.cook-cooks

2.watch-watches

3.build-builds

4.have-has

5.wash-washes

6.enjoy-enjoys

7.go-goes

8.receive-receives

9.cry-cries

10.close-closes

2.SentenceStructureandTransformation

1.Verb"tobe"changes:

Positivesentence:Subject+am/is/are+otherwords.

Example:Heisaworker.

Negativesentence:Subject+a