May I know which of the following sentence is more common used or appropriate ? Is any of them ungrammatical? 

1. All answers are to be written in black or blue ink.

2. All answers shall be written in black or blue ink.

3. All answers should be written in black or blue ink

4. All answers have to be written in black or blue ink. 

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joshua posted:

May I know which of the following sentence is more common used or appropriate ? Is any of them ungrammatical? 

1. All answers are to be written in black or blue ink.
2. All answers shall be written in black or blue ink.
3. All answers should be written in black or blue ink.
4. All answers have to be written in black or blue ink. 

Hi, Joshua,

All of the sentences are OK, and none of them is ungrammatical. As for the most natural, commonly used, and appropriate modal construction here, I recommend one that you have not used: "must."

5. All answers must be written in black or blue ink.

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