seesaw

grammar · medium

易错句子They played seesaw battle in the final.

正确表达They played a seesaw battle in the final.

seesaw 在这里是形容词，修饰单数可数名词 battle，所以名词短语前必须有不定冠词 a。汉语没有冠词，说英语时最容易把它漏掉；补上 a 才符合英语名词短语的规则。

grammar · medium

易错句子The final was very seesaw.

正确表达It was a seesaw final.

seesaw 作形容词只作定语，必须放在名词前面，不能用在 be 动词后面作表语。汉语可以说“这场比赛很波动”，英语不能照搬成 The final was seesaw，要改成 a seesaw final 这样的名词短语。

grammar · medium

易错句子The company's sales had a seesaw growth of 10% last year.

正确表达The company's sales had a steady growth of 10% last year.

seesaw 强调来回交替地上下波动、涨落不定，而这里说的是一年内单向稳定上升，语义对不上。表示单向、持续的增长要用 steady（稳定的）这类词，不能说 a seesaw growth。