I have been reading the grammar book for quite some time now and really love the content ans explanation. However, I find this particular part a bit confusing. This part is from Modal Auxiliary Verbs Part II. Page number 150.
Modal : Used to
With the first rule, used to has the same meaning as would. NOTE: This phrase can never be expressed as use to. It must always be used to.
subject + used to + verb in simple form. . .
Margaret used to always take off her shoes when she was a child.
(This represents a past habit.)
subject + be/get + used to + verb + ing
This second rule uses a form of the verb be or get in order to show that someone either is accustomed to something, or became accustomed to something.
I am used to taking a shower every morning before work.
(I am accustomed to taking a shower every morning before work.)
I got used to taking a shower every morning before work.
(I became accustomed to taking a shower every morning before work.)
What is confusing here is, both the for tells us that "Use to/Used to" is used to show something habitual.
What the explanation missing is, what form of main verb is used in both cases.
Why we are give two forms as we are using only one form in both the cases?