The continuous usage of the -te form, for instance.In most of the case I can think of, I believe this form can be replaced with のに/ので or だから. Are there cases where - te form is the only option?
What do you mean? Are you saying that a verb is omitted after 怖くて in your example?Also, I have seen the sentence 「私は怖くて。」which means "I'm afraid". What kind of verb can turn an adjective from "afraying"(passive form) to "afraid"(active form)?