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1. I had/got my wallet stolen in the train.
※使役動詞(have/get) もの ~ed(過去分詞) ものを~してもらう、~させる、~される
2. Seen from the sky, the building looks like a cross.
3. Weather permitting, we are going camping next Sunday. ※慣用表現:weather permitting 天気が良ければ
4. Strictly speaking, he does not come from the city. ※慣用表現:strictly speaking 厳密に言えば
5. She sat on the floor with her legs crossed. ※with one's legs crossed 足を組んで <付帯状況の分詞構文>
類例:腕を組んで with one's arms folded
参考にしてください。