按要求写单词。(10分)
(1)let us(缩写形式)                
(2)上个周末（汉译英）                  
(3)have (过去式)                  
(4)heavy(比较级)                      
(5)foot(复数）                    
(6)make（现在分词）                   
(7)bigger（反义词）                
(8)teach（单三形式）                   
(9)sing(过去式)                    
(10)thin(比较级)