___good （sound）加不加S

___good （sound）加不加S 名词sound加s? Sound什么时候加s these后面的sound（听起来）要加S吗? that 's sound good还是that 's sound nice 句式转换：Let’s do a sound check.（改为同一句）（ ） （ ） doing a sound che it's ___good food that we all like it very much Look!Those books are ___good price.Let's buy some.选择:A.at B. sound+?（词性） sound like+?(词性） That's sound interesting and good. 第三题sound用不用加s 划线的sound为什么要加s