We can see this from at least the following aspects.
Firstly,English has different tenses,which results in a great many changes of forms of its verbs.
Secondly,the English language also has varieties of types for almost each part of speech.For example,for the pronoun "I",its plural form is [we] as subject and [us]as object ,and also [our],[ours][ourselves],etc,which show the possible changes of the same word.
Then,the different spellings and pronunciations of the same word can also tell us something about the inflectional language.
In short,all the above helps us learn that English is an inflectional language.
wh-movement n.
【语法学】[转换语法用语] wh 移动(指英语中把以wh 起头的词如：who, which, what 等
疑问代词移到从句句首的转换规则
In syntactics,one of the branches of linguistics,the transformational rule of moving such WH- interrogative pronouns or interogative adverbs from clauses to the beginning of sentences.
Sorry,I haven't got the answer to the question[head movement].
祝你开心如意!O(∩_∩)O~~