The modal adverb 恐怕
The modal adverb (语气副词) expresses subjective judgment or assurance toward an action.
The adverb 恐怕 
has two meanings:
1) "probably, perhaps".
It may indicate a guess, or express a prediction about a situation that might happen.
has two meanings:
1) "probably, perhaps".
It may indicate a guess, or express a prediction about a situation that might happen.Examples
他回国了恐怕有一年了
He's probably been back in the country for a year
tā huíguó le kǒngpà yǒu yì nián le
他恐怕需要我们的支持
He probably needs our support
tā kǒngpà xūyào wǒmen de zhīchí
我嗓子疼，恐怕是感冒
I have a sore throat. I probably have a cold
wǒ sǎngzi téng, kǒngpà shì gǎnmào
2) "I'm afraid that...".
It also may express concern. It is often used when we are trying to politely refuse something.
For example: “I'm afraid I can't make it today”.
We often use modal verbs after 恐怕. For example:
要
会
能
得
会
能
得 Examples
恐怕我们没有办法帮助你
I'm afraid we can't help you
kǒngpà, wǒmen méi yǒu bànfǎ bāngzhù nǐ
我们恐怕要分手了
I'm afraid we have to break up
wǒmen kǒngpà yào fēnshǒu le
恐怕不行
I'm afraid it’s not okay
kǒngpà bù xíng