Conditionals
This is the easiest conditional.
Present + Present
Zero conditional
4
GERUND
This is a modal in past you use to express a possibility.
COULD HAVE + PARTICIPLE
MIGHT HAVE + PARTICIPLE
Conditionals can be classified into "real" and...
"unreal"
The first conditional is a combination of:
Present +
Future (will, can or may)
TRY + _____________
(something new, an experiment)
INFINITIVE
You can use this modal in past to express regret
SHOULD HAVE + PARTICIPLE
This conditional talks about a real possible future:
1st conditional
The second conditional uses this tense in the first half (the cause)
PAST TENSE
REMEMBER +
(IN THAT MOMENT)
INFINITIVE
MUST HAVE + PARTICIPLE
The most common conditional for hypothetical situations.
2nd conditional
WOULD, (COULD, or MIGHT)
MODAL VERBS +
INFINITIVE without TO
SIMPLE FORM
This modal in past is used to express that something was IMPOSSIBLE.
What part of the sentence is 1st conditional?
You'll fail the test if you don't study.
if you don't study
The zero conditional is a combination of If + present simple verb,
present simple verb
AVOID
GERUND
What's the problem with the following sentence using a modal in past:
"He could have a problem."
It's missing the verb in participle.
He could have HAD a problem.