"trigger" words

"Triggers" are time expressions which determine, or strongly influence, the use of a particular tense.
Choose a short text or part of a text.

Highlight each verb tense in a different colour.

Look for "trigger" words for each tense.
Highlight these words, too.
Example
"He WENT there three weeks AGO"


•the tense is the Simple Past
•the trigger word is 'ago'
The trigger may be in the preceding sentence