4．I find it beautiful.我觉得它好看。

动词find经常用于动词 宾语 宾语补足语这种结构：You'll find it difficult／easy to make conversation with her.你将会发现与她聊天很困难／容易。（ it代指后面的不定式短语）

I find this book very interesting.我觉得这本书很有趣。

5．A man can never have too many ties.男人有多少领带也不会嫌多。

cannot／can never…too…（固定结构）表示“无论怎么……也不会过分”：A woman can't have too many hats.女人有多少帽子也不嫌多。

You can't be too careful in doing your work.你工作越小心越好。