Present tense
I strike
You strike
He/she/it strikes
We strike
You strike
They strike
Present perfect
I have struck/stricken
You have struck/stricken
He/she/it has struck/stricken
We have struck/stricken
You have struck/stricken
They have struck/stricken
Past Tense
I/You/He,she,it/We/You/They struck
Past Perfect
I/You/He,she,it/We/You/They had struck/stricken