Here are some examples of the common auxiliary verbs in action:
• Do you like German food?
• Does your mother speak English?
• Did you come to school yesterday?
• Why are you talking? You should be listening to me!
• I was having a bath when you called!
• A new road is being built behind the school.
• Have you done your homework?
• My father has never visited the USA.
• How long have you been living in Germany?
• By this time next year I will have been learning English for 35 years!
Other common auxiliary verbs are: will, should, would, can, must, might, may, could (These verbs are often called modal verbs).
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Contracted auxiliaries
The auxiliary verbs are very often contracted. For example, you can say I`m playing tennis tomorrow, instead of I am playing tennis tomorrow. The contracted form (which needs an apostrophe) is more likely to be used in spoken language*. So, for example, it would be a little unusual to ask your friend: Why did you not call me yesterday? More probable is: Why didn`t you call me ..?
On the other hand, if you are doing a written report or essay, it is more usual to write the full form: Why did America not join the war until 1941? (instead of: Why didn`t America ..?).
The short form itself often has two alternatives, which are equally usual and correct. For example:
• She`s not going to the dance.
• She isn`t going to the dance.
• I haven`t seen him for ages.
• I`ve not seen him for ages.
* The full form is common in spoken language when the speaker wants to emphasize what she is saying. For example:
• Why don`t you call him?
• I have called him.
• I do not want to see him again.
Agreement
Agreement is the word for the correct matching of the subject and the verb in a sentence. (Another way to say this is that the subject and verb go together.) English has very few verb endings and the only one that learners really have to worry about is the -s ending in the present simple tense. As an example, let`s look at the verb to work:
Singular Plural
1st person I work We work
2nd person You work You work
3rd person He works
She works
It works They work
It can be seen that the -s is needed in the 3rd person singular *. It is not correct to say He work .., She like .. etc. And of course, it is also not correct to forget the -s when the 3rd person subject is a noun and not a pronoun. So you have to say: My father works in a bank. My mother drinks green tea for breakfast every day. Oil floats on water. You also need to remember the -s in sentences with relative pronouns. So, for example, it must be: Do you know the man who lives in the next apartment? A carnivore is an animal that eats other animals.
Don`t forget the -s when the verb is used as an auxiliary:
• Does your mother like English food?
• She has forgotten her homework again
(* Modal verbs like will, would, may, must etc. do NOT have an -s in the 3rd person singular.)
Irregular verbs
beat - beat - beaten
become - became - become
begin - began - begun
bend - bent - bent
bite - bit - bitten
blow - blew - blown
break - broke - broken
bring - brought - brought
build - built - built
burst - burst - burst
buy - bought - bought
catch - caught - caught
choose - chose - chosen
come - came - come
cost - cost - cost
cut - cut - cut
dig - dug - dug
do - did - done
draw - drew - drawn
drink - drank - drunk
drive - drove - driven
eat - ate - eaten
fall - fell - fallen
feed - fed - fed
feel - felt - felt
fight - fought - fought
find - found - found
fly - flew - flown
forget - forgot - forgotten
freeze - froze - frozen
give - gave - given
go - went - gone
grow - grew - grown
have - had - had
hear - heard - heard
hide - hid - hidden
hit - hit - hit
hold - held - held
hurt - hurt - hurt
keep - kept - kept
know - knew - known
lead - led - led
leave - left - left let - let - let
light - lit - lit
lose - lost - lost
make - made - made
mean - meant - meant
meet - met - met
pay - paid - paid
put - put - put
read - read - read
ride - rode - ridden
ring - rang - rung
rise - rose - risen
run - ran - run
say - said - said
see - saw - seen
sell - sold - sold
send - sent - sent
shake - shook - shaken
shine - shone - shone
shoot - shot - shot
shut - shut - shut
sing - sang - sung
sink - sank - sunk
sit - sat - sat
sleep - slept - slept
speak - spoke - spoken
spread - spread - spread
stand - stood - stood
steal - stole - stolen
stick - stuck - stuck
strike - struck - struck
sweep - swept - swept
swim - swam - swum
take - took - taken
teach - taught - taught
tear - tore - torn
tell - told - told
think - thought - thought
throw - threw - thrown
wake - woke - woken
wear - wore - worn
win - won - won
write - wrote - written