What are the causal related words?

Single use: "because, because, because, because, so, so, so, so, so, so, so";

Use in pairs: "because (because) ... so (only, just, then, therefore)" "because ... is (because, because)" and so on;

Infer causal sentences, partial sentences put forward what has happened, and affirmative sentences infer what should happen. Common related words are: "Since it is visible"; Because ... then (just, again, convenient, then, obviously).