1. There are certain techniques you can learn and it is up to you to practice, practice and practice. [考点] be up to
[点拨] be up to主要义项：①“从事于，忙于，暗中作事”，后面接名词、代词或动名词；②“由某人来决定，应由某人做某事”，常用it作形式主语；③“胜任，适合”，多用于否定句或疑问句。
[例句展示]
Don’t trust him, he is up to some tricks.
别相信他，他在暗中捣鬼。
