一般过去时态中不规则动词的过去式put cut hit read let beat hurt cost 规律：
还有 keep sleep sweep 规律：
teach catch 规律：
bring buy think 规律：
begindrinkring sing swim sit 规律：
lend send spend build规律：
sell tell 规律：
say pay 规律：
meet feed 规律：
grow know throw fiy 规律：
要过去式！