①It would be intolerable ...中:it作形式主语
②an unplanted fenced garden...中:unplanted过去分词作定语前置
③these must be what annually turn my mind toward all that work中:what引导的名词性从句
④quite as beautiful as a vegetable garden中:as...as...形容词比较级
⑤a personal reassurance that中:that引导同位语从句
⑥what April was for中:what引导宾语从句
希望能帮到楼主,!