" I don't what does inverted past perfect tense means ? No sooner had I become a member of EF then I started posting messages. After the "no sooner" part we should use an inverted past perfect ( had I become as opposed to the normal (not inverted) "I had become ; the past perfect marker "had" comes before the subject) There are other ways to write this sentence.
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urajaSome where I found example like this "No sooner ....than + past tense." I don't what does inverted past perfect tense means ?No sooner had I become a member of EF then I started posting messages.