湯姆忘了要怎麼做。

Tom has forgotten how to do that.

Source: Tatoeba

Sentence Composition

1 湯姆 Tāngmǔ Tom (name)
2 忘 wàng
  1. to forget
  2. to overlook
  3. to neglect
=3 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=3 了 liǎo
  1. to finish
  2. (used with 得 dé or 不 bù after a verb to express (im)possibility, as in 忘不了 wàngbuliǎo "cannot forget")
  3. (literary) (usually followed by a negative such as 无 wú or 不 bù) completely (not); entirely (not); (not) in the least
  4. to understand clearly (variant of 了 liǎo)
=3 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=3 了 liào unofficial variant of 瞭 liào
=4 要 yāo (bound form) to demand; to coerce
=4 要 yào
  1. to want; to need; to ask for
  2. will; shall; about to
  3. need to; should
  4. if (same as 要是 yàoshi)
  5. (bound form) important
=4 要 yǎo
  1. (archaic) alternative form of 偠 (yǎo)
  2. alternative form of 偠 (yǎo)
  3. used in 要褭／要袅
5 怎麼 zěnme
  1. how?
  2. what?
  3. why?
6 做 zuò
  1. to make; to produce
  2. to write; to compose
  3. to do; to engage in; to hold (a party etc)
  4. (of a person) to be (an intermediary, a good student etc); to become (husband and wife, friends etc)
  5. (of a thing) to serve as; to be used for
  6. to assume (an air or manner)