Correction. 

Are you going to attend their wedding? 

/ə ju gəʊɪŋ tu ə’tend ðeə wedɪŋ/

Are you sure?

/ə ju ʃɔ:/ 

At 7 o'clock in the morning.

/ət ‘sevən  ə’klɒk ɪn ðə ‘mɔ:nɪŋ/

Right here.

/rɑɪt hɪə/

Nobody is helping us.

/‘nəʊbədi ɪz ‘helpɪŋ ʌz/

Let me think about it.

/let mi θɪŋk ə’bɑʊt ɪt/

Can you help me?

/kən ju help mi/ 

Come with me!

 /kʌm wɪð mi/

I'm looking for John.

/ɑɪm lʊkɪŋ fə ʤɒn/

See you later!

/si: ju leɪtə/

I've been learning English for 1 month.

/ɑɪv bi:n ‘lɜ:nɪŋ ‘ɪŋglɪʃ fə wʌn mʌnθ/  

Don't worry!

 /dəʊnt ‘wʌri/

I feel sick.

/ɑɪ fi:l sɪk/ 

Hurry up!

/’hʌri ʌp/