Error at inserting variables inside html format Mail body

Help
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1

“Hi”+variable+“bye”. It’s a HTML formated mail body. I have a very large code in real. and many variables inside as well. I’ve written the whole code like a first statement in this topic. I’m getting that error end of expression expected. None of the double quotes are misplaced. checked it many times. what else could be the reason.

2

Hi
Kindly check once whether we have used any single quote or brackets along the expression
even we can check that in the input field itself with a red curly line beneath the place where we are missing with a symbol
Cheers @vicky12345678901