Not only I but B can't do this as well. vs Not only I but alos B can't do this...

[Infin1ty]

Hi everyone,

I want to express an idea: I failed to do something, B is another guy. Although he is better than me, he also coundn't do this thing. Could I say:

Not only I but B can't do this as well. / Not only I but alos B can't do this.

Not only I can't do this, but B can't as well. / Not only I can't do this, but also B can't.

or

I can't do this, neither he can.

Are all my sentences correct? Can they express the same meaning? Do they sound natural? If they don't sound natural, could you give me any alternative suggestions? Please correct me if you find any mistake in my post. Thanks in anvance.
:D
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Please feel free to correct me if you find any mistakes in my posts.

[Alan]

Hi Infinity,

Let me suggest some changes:

[Infin1ty]

[Alan]

Hi Infinity,

Thanks for pointing out the typo, which I have now corrected. After certain words like 'not only' 'hardly' 'scarcely' 'never' at the beginning of the sentence we usually have what is called inversion - verb followed by subject. Examples:

Never have I seen such a disaster.
Not only have we tried to explain the meaning but also to give examples.
Hardly had we got home when the letter arrived.
Scarcely had I written the letter when I saw the mistake.

Alan
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English as a Foreign Language
You can read my EFL story Progressive Forms

[Infin1ty]

Thank you, Alan, for you patient and detailed explanations, which really helped me out. :D(I don't know if it is possible for me to say" patient explanations". I mean to say: Thank you for explaining those to me patiently. Perhaps the word 'possible' I used is not proper here. So please correct if any mistakes are found in my sentences. Thank you!).
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Please feel free to correct me if you find any mistakes in my posts.

[Cerberus™]

[Infin1ty]

Thank you very much, Cerberus. : )
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Please feel free to correct me if you find any mistakes in my posts.

[Alan]

Hi Infinity,

I must admit I've never heard 'patient' being regarded as 'unusual' when applied to things rather than people. 'Patient explanations' is fine in my book.

Alan
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English as a Second Language
You can read my ESL story Passive Voice

[Infin1ty]

Thank you, Alan. Your messages help me a lot as they always do. (I intended to say: Your messages are helpful as they always are. Or Your messages are as helpful as they were before. Please let me know if they make sense to you.) Wish you have a nice day! : )
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Please feel free to correct me if you find any mistakes in my posts.

[Alan]

Hi Infinity,

'Helpful' used in both sentences is fine.

By the way I'm glad they are helpful to you.

Alan
_________________
English as a Foreign Language
You can read my EFL story Prepositions

[Cerberus™]