[语境中体悟用法]
朗读下面短文，体会、领悟情态动词在具体语境中的含义，掌握其形式变化及其用法。
Lucy is an outgoing lady. She can① play many kinds of musical instruments. Actually, she could② play the piano when she was 8 years old. Lucy also keeps taking exercise every day. She says that she has to③ do some sports because she must④ keep slim.
“You shall⑤ get fat soon if you don't take exercise every day.” She usually says to her friends.
As for her, an elegant lady, should⑥ try to keep fit. However, last week, she found that she might⑦ put on weight and she was worried and decided to lose weight. And these days she is always thinking that she may⑧ succeed soon if she tries all her best. However, she is always lack of time because she ought to⑨ take care of her children.
One night after supper, she walked quickly in order to go dancing at the Tomorrow Park but she was late. On her way, she thought that the dancing must have begun⑩， and the coach could have taught or shown? many new moves. She was afraid that her friends might have left? before she got there. She was regretful then. She should have had? supper earlier, or she could have taken a taxi?， and indeed she needn't have taken? a bath in advance. When she reached the park finally, she found nobody was there. She remembered suddenly that it had been reported on the radio that there would be a heavy rain that night.
