"Had struck off" is the past perfect tense.
"Set off" does not have a past tense. The verb of it (to set off, did set off, will set off, have set off, had set off, ect.) will change based on the tense it is in.
I fell off the chair.
my cat fell off my roof
You may be referring to the word in a different meaning, but the word "big" is an adjective with no past or present tense. It is used to define a noun, such as, "The big rocket took off from the launch pad."
The first general student strike in US history happened in the 1970s. It was due to the invasion of Cambodia.
Past perfect is had + past participle.Because realize is a regular verb the past participle is realized ( plus ed )had realized.I had realized my mistake when the alarm went off.
The past tense of "drop off" would be "dropped off".
The past tense of "step off" is "stepped off."
The past tense of "turn off" is "turned off." For example, "I turned off the lights before leaving the room."
The past tense of 'hold off' would be 'held off.'
It is the past tense of the word "strike". "Strike" usually means "hit", but also has the specialized meaning of a workforce walking off their jobs en masse.
The past tense of the compound verb "lay off" is "laid off."
The word off doesn't have a past tense. Only verbs have tenses.
The past tense of "say" is "said."
"Set off" does not have a past tense. The verb of it (to set off, did set off, will set off, have set off, had set off, ect.) will change based on the tense it is in.
The past tense of turn off is turned off.
The present tense of tore is tear.