finds costs phones answers buys 过去式有s吗

civility costs nothing and buys everything什么意思 过去式的句式结构?Welcome your answers! the book of answers有中文的吗 She usually buys DVDs ______Tom's birthday rain有过去式吗 “can”有过去式吗? thank 有过去式吗 some有过去式吗 with有过去式吗? should有过去式吗? must有过去式吗 He buys what his son wants这句话有语病吗