Questions concerning the types of words and phrases which are grouped and ordered meaningfully to express a statement, question, or another type of sentence

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Has anyone used ChineseSkill here?

Has anyone used ChineseSkill here? This is the best app I've seen so far for learning chinese . But why am I wrong here?
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Why is there no 了 in 以前我住在这儿

I am used to hearing phrases like this: 我住在这儿 To say "I lived here [before]", however, it seems you can't use 了 at all: 以前我住在这儿 Why is this not "以前我住了在这儿"? Is there a formal reason why 了 ...