Correct

焉

/ yān / 
Strokes

Definition

where/how

Example

As a Pronoun

[used to refer to the person, the thing, the place] here; this

1
Zuì
罪
mòdà
莫大
yān
焉
  
。

There is no greater crime than this.

2
Sān
三
rén
人
xíng
行
  
,
bìyǒuwǒshī
必有我师
yān
焉
  
。

Where there are three men walking together, one of them is bound to be able to teach me something.

As a Pronoun

how; why

3
Shājīyānyòngniúdāo
杀鸡焉用牛刀
  
?

Why kill a chicken with an ox cleaver?

4
Yānnéng
焉能
bù
不
qù
去
  
?

How could I possibly not go?

5
Bùrùhǔxué
不入虎穴
  
,
yāndehǔzǐ
焉得虎子
  
?

If we don't get into the tiger's den, how can we get hold of its cubs?—Nothing ventured, nothing gained.

As a Particle

[used at the end of a sentence for emphasis]

6
Xìng
幸
wù
勿
shěn
哂
yān
焉
  
。

Please don't laugh at me.

As an Adverb

only then