Why are there so many rules in English grammar? Is every rule considered necessary?

[english_extreme]

Except for basic rules that I know are necessary, there are some excessive rules that have no benefits other than to complicate things for the user because a whole sentence is already self-explanatory.
For example:
I go to school.
He go to school.
He go to school yesterday.
The above 3 sentences are self-explanatory without the proper English verb 'went' and 'goes'.

One mouse, two mouse, three mouse. Instead of one mouse, two mice, three mice.

Even a native speaker also admits that there is another language that is easier than English to use.

 

[SoothingDave]

Nobody designed or invented the language. There have always been simplified pidgins that facilitate communication and commerce.

There is, however, a vast difference in the ideas that can be expressed with a pidgin versus the actual language.

 

[5jj]

As so often happens when people make claims about the implicity of some language, the speaker in #1 exaggerates the simplicity of Indonesian. He suggests that Indonesian das only one form for verbs - much simpler than eat/ate or go/went. He fails to mention such forms as these:

• ajar = to teach
• ajari = to teach (imperative, locative)
• ajarilah = to teach (jussive, locative)
• ajarkan = to teach (imperative, causative/applicative)
• ajarkanlah = to teach (jussive, causative/applicative)
• ajarlah = to teach (jussive, active)
• ajaran = teachings
• belajar = to learn (intransitive, active)
• diajar = to be taught (intransitive, active)
• diajari = to be taught (transitive, locative)
• diajarkan = to be taught (transitive, causative/applicative)
• dipelajari = to be studied (locative)
• dipelajarkan = to be studied (causative/applicative)
• mempelajari = to study (locative)
• mempelajarkan = to study (causative/applicative)
• mengajar = to teach (intransitive, active)
• mengajarkan = to teach (transitive, casuative/applicative)
• mengajari = to teach (transitive, locative)
• pelajar = student
• pelajari = to study (imperative, locative)
• pelajarilah = to study (jussive, locative)
• pelajarkan = to study (imperative, causative/applicative)
• pelajarkanlah = to study (jussive, causative/applicative)
• pengajar = teacher, someone who teaches
• pelajaran = subject, education
• pelajari = to study (jussive, locative)
• pelajarkan = to study (jussive, causative/applicative)
• pengajaran = lesson
• pembelajaran = learning
• terajar = to be taught (accidentally)
• terajari = to be taught (accidentally, locative)
• terajarkan = to be taught (accidentally, causative/applicative)
• terpelajar = well-educated, literally "been taught"
• terpelajari = been taught (locative)
• terpelajarkan = been taught (causative/applicative)
• berpelajaran = is educated, literally "has education"

Indonesian language - Wikipedia

en.wikipedia.org