i

Present tense is used for:
Events happening now.
Events which are always true.

ii

There are two kinds of present tense:
Simple present for one-off and always true events.
This project investigates (simple present) ...
Present continuous for repeated or ongoing events, happening now.
This project is investigating (present continuous) ...

iii

Past tense is used for:
Events which have already occured.

iv

There are four kinds of past tense:
Simple past for actions completed at a known time in the past.
this generated (simple past) ...
Past continuous for repeated or ongoing events (note: this is infrequently found in formal writing, but may be seen, as below).
it was found that this was generating (past continuous or imperfect) ... Pluperfect for events which happened once, before the past event that is the main focus of your sentence.
after the results had been generated (pluperfect), it was possible to...
Present perfect for events which happened in the past but continue to be true. The primary results have generated (present perfect) ...

v

Future tense is used for:
Events happening in the future.

vi

There are two kinds of future tense:
Simple future.
The results will show (simple future) ...
Future in the present.
The results are going to show (future in the present) ...

vii

Modal verbs are used for: events which may or may not occur.

viii

There are five main kinds of modal verbs:
viii.i Would:
In this case it would be possible to deduce...
viii.ii Could:
There could be one of two outcomes...
viii.iii Should:
There should be a clear answer to this question...
viii.i May/Might:
It may be possible to infer from this result that...
viii.ii Can:
These results show that the probe can measure speed accurately in these conditions...

ix

Subjunctive verbs are used to show doubt:If the cook stove were to blow up, then...
Subjunctive verbs follow words of condition, doubt or moral imperative, such as if: If the field conditions were (subjunctive of the verb ‘to be’) sufficiently hot, there would be an adverse effect on the weldment.

x

Infinitives do not carry tense but show the stem of the verb: to measure.
Note: Ideally, infinitives should not be split. To measure (verb in the infinitive) accurately (adverb or post-qualifier)
not
To accurately measure.