In addition to Stuart F's discussion of the second person plural "you" which has for the last 300 years been the only form in most types of English the (now obsolete) first person singular has nominative and accusative forms "thou" and "thee".

This means that a person in the 1600s would have turned your sentences into "Thou likest snakes" and "Snakes like thee" which have the form you expect from the first person singular.

The reasons that Standard English dropped the first person singular are complex and rooted to some extent in the politics of the late 1600s but some regional dialects preserved it in a slightly altered form until at least the late 1900s.

In addition to Stuart F's discussion of the second person plural "you" which has for the last 300 years been the only form in most types of English the (now obsolete) second person singular has nominative and accusative forms "thou" and "thee".

This means that a person in the 1600s would have turned your sentences into "Thou likest snakes" and "Snakes like thee" which have the form you expect from the first person singular.

The reasons that Standard English dropped the first person singular are complex and rooted to some extent in the politics of the late 1600s but some regional dialects preserved it in a slightly altered form until at least the late 1900s.

In addition to Stuart F's discussion of the second person plural "you" which has for the last 300 years been the only form in most types of English the (now obsolete) second person singular has nominative and accusative forms "thou" and "thee".

This means that a person in the 1600s would have turned your sentences into "Thou likest snakes" and "Snakes like thee" which have the form you expect from the first person singular.

The reasons that Standard English dropped the first person singular are complex and rooted to some extent in the politics of the late 1600s but some regional dialects preserved it in a slightly altered form until at least the late 1900s.

In addition to Stuart F's discussion of the second person plural "you" which has for the last 300 years been the only form in most types of English the (now obsolete) first person singular has nominative and accusative forms "thou" and "thee".

This means that a person in the 1600s would have turned your sentences into "Thou likest snakes" and "Snakes like thee" which have the form you expect from the first person singular.

The reasons that Standard English dropped the first person singular are complex and rooted to some extent in the politics of the late 1600s but some regional dialects preserved it in a slightly altered form until at least the late 1900s.