以下の英文の解釈をお願いします。
以下に英文（大幅に省略しているので文章の繋がりは読めないです、スミマセン)と、それに対する疑問点を書かせていただきます。よろしくお願いいたします。
It is a beneficial thought that we were once children.(省略) We try to behave not as we want to behave, nor even as we think we ought to behave, but as we think others expect us to behave. So we enter into a world of pretence and deception, deceiving others and perhaps ourselves as well, and being deceived by them in turn. So we are placed under a continual strain.(省略) After all, it isn't so easy to act the part of someone else, according to what we imagine others may be expecting of us, especially when that expectation may change from day to day. As for all this strain, I hardly need add how harmful it must be to our health. (省略) Pretending we are still children is just as bad as pretending we are other adults than ourselves.(省略) All pretence is positeively harmful, if only by putting us under a strain and so impairing our health. At the same time, we must recognize there's still something of the child left in us. We never grow up in such a way as to leave the past entirely behind us. What we were, in a deep sense, we still are: and it is important for our health and peace of mind to admit the fact.
2(5)文目で"we think(imagine)"という挿入がなされている所が上手く訳出できませんでした。3文目の"in turn"は「騙し、その次には騙される」という感じで訳したのですがどうでしょうか？10文目で"such a way as to～"に関してこれは"so as to～"的に訳せばいいのでしょうか？11文目は":"の前の部分の構造がまったくわかりませんでした。
お礼
ありがとうございましたm(__)m