第一组早上学习，第二组晚上学习。

The first group studies in the morning, the second in the evening.

Source: Tatoeba

Sentence Composition

=1 第一 dìyī
  1. first
  2. most important; primary; foremost
=1 第一 dì-yī
  1. (literally, figuratively) first; 1st
  2. being the most important consideration; being essential, or a priority; coming first
  3. first; 1st
  4. firstly
  5. number one; #1; first (in a test, competition, etc.)
=2 组 Zǔ surname Zu
=2 组 zǔ
  1. to form
  2. to organize
  3. group
  4. team
  5. classifier for sets, series, groups of people, batteries
3 早上 zǎoshang early morning

classifier: 個
4 学习 xuéxí
  1. to learn
  2. to study
=5 第二 dìèr
  1. second
  2. number two
  3. next
  4. secondary
=5 第二 dì'èr
  1. next
  2. second
  3. second; 2nd; number two
  4. secondly
=6 组 Zǔ surname Zu
=6 组 zǔ
  1. to form
  2. to organize
  3. group
  4. team
  5. classifier for sets, series, groups of people, batteries
7 晚上 wǎnshang
  1. evening
  2. night
  3. in the evening

classifier: 個
8 学习 xuéxí
  1. to learn
  2. to study