Sentence correction please

"struck" is past tense, so you need the past tense of "enter"

Reality struck while opportunity entered.

Or use the present tense of "struck"

Reality strikes while opportunity enters.

What about:

Reality struck then opportunity enters.

I think you have a mixed metaphor.

Opportunity (occasionally) knocks. Then you must open the door and allow opportunity to enter.

There's also, "Opportunity knocks but once."

And, "Strike while the iron is hot."

No sorry. I wasn't going for a metaphor or idiom of any sort just a sentence I wanted corrected.

pleasehelp Reality struck then opportunity enters.

"Reality struck, and then opportunity entered."
"Reality strikes, and then opportunity enters."

When you combine the clauses using "and then," they both need to be in the same tense.

Does everything have to be in full sentences?

I mean African Americans have their own English lingos and they can describe a whole paragraph in a few words.

What's the difference between Black English and Standard American English?

Avangi is correct, using "then" or "and then" still requires tenses to be the same.

And black english ignores the proper rules of grammer. ("He done work." instead of " He has finished working.)
That topic would require a whole separate forum.