When talking about schedules, timetables and itineraries, the present simple tense is used to refer to a future event that is planned and is not likely to change:
if + past subjunctive | would + infinitive (simple or continuous)
The second conditional can describe an unreal situation with reference to the present. We imagine a hypothetical situation which contrasts with reality:
Time is a concept which is related to our perception of reality. There are three times: past, present and future. Tense is a grammatical category which is marked by verb inflection and expresses when an event or action happens in the flow of time.
Strictly speaking, only two English tenses are marked by the inflection of the verb:
This pattern is used for wishes about the future when there is a chance that something may happen or somebody (but not the person who wishes) may change their behaviour:
