老师说它是有用的但是我认为它是困难的。英语：The teacher said it was useful, but I thought it was difficult.
重点词汇
老师：teacher;schoolmaster.
有用：useful;serviceable;valuable;come in useful;utility;of use;help;avail.
但是：but ; however;yet;still;only.
我认为：in my submission;I guess;my bet is;if you ask me;it's my bet.
困难：difficulty;difficult;hard;bump;financial difficulties;hardship;hassle;problem.
英语：English.
怎么：how;what;however;somewhat;how could.
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