球队已经训练了几天，所以这个足球场有些泥泞，不太好用了。

Because it had been raining for a couple of days, the pitch was muddy and difficult to play on.

Source: Tatoeba

Sentence Composition

1 球队 qiúduì sports team (basketball, soccer, football etc)
=2 已经 yǐjīng already
=2 已经 yǐjìng already
3 训练 xùnliàn
  1. to train
  2. to drill
  3. training

classifier: 個
=4 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=4 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)
=4 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=4 了 liào unofficial variant of 瞭 liào
5 几天 jǐtiān several days
6 所以 suǒyǐ
  1. therefore
  2. as a result
  3. so
  4. the reason why
7 这个 zhège
  1. (pronoun) this
  2. (adjective) this
8 足球场 zúqiúchǎng
  1. football field
  2. soccer field
9 有些 yǒuxiē
  1. some
  2. somewhat
10 泥泞 nínìng
  1. muddy
  2. mud
11 不太好 bùtàihǎo
  1. not so good
  2. not too well
12 用 yòng
  1. to use; to make use of; to employ
  2. (coverb) with; using
  3. to need; to have to (usu. used in the negative or in questions)
  4. usefulness; utility
  5. (bound form) expense; outlay
  6. (courteous) to eat; to drink
  7. (literary) hence; therefore
=13 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=13 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)
=13 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=13 了 liào unofficial variant of 瞭 liào