It's because there is very little pattern to it.
if you were to conjugate a verb in english, say: 'Go', as opposed to the word 'ago' in latin of the same meaning you can see.
I Go, you go, he/she/it goes, we go, you go, they go
ago, agis, agit, agimus, agitis, agiunt
In latin 'I GO', and 'you GO' use two distinct words; as opposed to english where not only are the words the same but "you" could be plural or singular to someone who may not know the language.
all of these patterns and lack thereof make english difficult to learn
if you were to conjugate a verb in english, say: 'Go', as opposed to the word 'ago' in latin of the same meaning you can see.
I Go, you go, he/she/it goes, we go, you go, they go
ago, agis, agit, agimus, agitis, agiunt
In latin 'I GO', and 'you GO' use two distinct words; as opposed to english where not only are the words the same but "you" could be plural or singular to someone who may not know the language.
all of these patterns and lack thereof make english difficult to learn