subject +
auxiliary verb + main verb
An auxiliary verb is used in all tenses.
*In the simple present and simple past tenses, the
auxiliary verb is usually suppressed for the affirmative, but it does
exist for intensification.
|
structure |
past |
present |
future* |
auxiliary |
main verb |
simple |
normal |
|
|
I worked |
I work |
I will work |
intensive* |
do |
base |
I did work |
I do work |
|
perfect |
have |
past participle |
I had worked |
I have worked |
I will have worked |
continuous |
be |
present participle -ing |
I was working |
I am working |
I will be working |
continuous perfect |
have been |
present participle -ing |
I had been working |
I have been working |
I will have been working |
|