I'm sure others can post a list of indicators for conclusions (e.g., thus, therefore, hence, so). However, conclusion indicators can be misleading. I find it MUCH more helpful to identify the premise indicators. These are: because, since, after all, and for example. Not only do those words introduce a premise, but the structure of the sentence will also point you right to the conclusion (right before or after the premise.
A since B. B is the premise, and A is the conclusion.
Because of C, D is true. C is the premise, and D is the conclusion.
E. For example, F. E is the conclusion, and F is a premise.
I'm a pimp. After all, I clock bitches and slap hoes.
i'm a pimp is your conclusion. your necessary assumption is that anyone who clocks bitches and slaps hoes is a pimp. a weakener would be a man who beats his wife, who is a practicing prostitue, but does not actually have her bang men for $.