由...组成 (yóu...zǔchéng : be consisted of)

Today, we are going to learn a new pattern: 由...组成, which means "be made up from". 

由yóu means "from", and 组成 zǔchéng means “be composed of (certain components)". For example, 

• 电脑由软件和硬件组成。The computer is made up of software and hardware. 
• 拼音由声母、韵母、和声调组成。A pinyin is consisted of initials, finals, and tones.
• 地球表面由陆地和海洋组成。Dìqiú biǎomiàn yóu lùdì hé hǎiyáng zǔchéng. The surface of the Earth is made up of lands and oceans. 

So, you can say "A 由 X, Y, 和Z组成". Please try to rearrange the words and form sentences:
1. 一年   十二个月   由      组成

2. 一个  由     星期      组成     七天   

3. 鸡蛋  组成   还有  蛋清  蛋黄  蛋壳  由
4. 这个    英文    由     四个     字母      单词      组成
5. 形声字  由   声旁   形旁     和    组成
  

Please describe the following picture. 

Please try to translate the following sentences:

1. The teacher asked the students what water was composed of.
2. Wang Jiaming said a water molecule is made up of two hydrogen atoms and one oxygen atom. 

• hint: 
• a water molecule=水分子Shuǐ fèn zi, 
• oxygen atom=氧原子yǎng yuánzǐ, 
• hydrogen atoms=氢原子qīng yuánzǐ.