Watch out for early: it ends in -y, so the y becomes ier: earlier, the earliest.
Careful: lately is a different word — it means recently, not late. He arrived late and He has been busy lately say different things.
试一试: Hiroshi runs ___ Lars. (faster than / more fast than / faster that) 答案: faster than — fast 是短单词，所以加 -er：faster（不能说 "more fast"）。比较两个人的时候，用的词是 than，不是 "that"：faster than Lars。
Of all the guides, Mei explains the most carefully.
试一试: Sofia speaks ___ her brother. (more clearly than / clearlier than / more clear than) 答案: more clearly than — clearly 以 -ly 结尾，所以前面用 more，不能加 -er 词尾（不能说 "clearlier"）。而且要保留这个 -ly 单词本身，来说她说话的方式：more clearly than（不能说 "more clear"）。
well, badly, far
有几个词有自己的特殊形式。做得好的时候，用 better 和 the best。做得差的时候，用 worse 和 the worst。说距离的时候，far → farther → the farthest（或 further → the furthest）。
Mei sings better than me.
I slept worse than usual last night.
Lars threw the ball the farthest (or the furthest) of all.
试一试: Mei sings ___ me. (better than / more well than / gooder than) 答案: better than — 做得好的比较形式是 better，不是 "more well"。而且 "gooder" 会跟 good 搞混。所以要说：she sings better than me。
试一试: Of the whole team, Amina trained ___ and prepared ___ for the race. (the hardest … the most carefully / the most hard … the carefullest / the hardest … the carefullest) 答案: the hardest … the most carefully — 说一群人里做得最好的，hard 是短单词 → the hardest。carefully 以 -ly 结尾 → the most carefully。短单词加 -est，-ly 单词用 the most。