Can you please correct these sentences?

[twilit1988]

My dear and respected teachers,
1 : "Of what subject paper did you write today".? correct it please.
2 : "I don't have much vocabulary of English language that's why I don't feel confident when speaking it". Correct?
3 : "A fish bone stuck in my throat". correct?
4 : "I helped him in improving English" correct

[Soup]

1. What subject did you write your paper on today?

2. I don't know much vocabulary. Which is why I lack confidence when speaking English.

3. A fish bone got stuck in my throat. / I have a fish bone stuck in my throat. / There's a fish bone stuck in my throat.

4. I helped him improve his English. / I helped him with improving his English.

[Grace Ann]

1. On what subject did you write about today?

2. I don't have much vocabulary which is why I lack confidence when speaking English.

3. A fish bone got stuck in my throat. / I have a fish bone stuck in my throat. / There's a fish bone stuck in my throat.

4. I helped him improve his English. / I helped him in improving his English.

[LynetteKhan]

1. What topic did you write about today.
2. I am not fluent in English therefore I do not feel confident speaking.
3. A fish had stuck in my throat.
4. I helped him improve his English.

[Raymott]

Originally Posted by Grace Ann

1. On what subject did you write about today? You'd need to delete either 'on' or 'about'. 'Subject' can't be the object of both prepositions.

R.