don't know how I should clean it well .
=I don't know how __to__clean ____ it well .
He is ten years old .
=He is _at___ the___ age__ of____ ten.
=He is a____ ten____ boy .
We write with our hands .
=We _use___our hands __to__ __write__ .
don't know how I should clean it well .
=I don't know how __to__clean ____ it well .
He is ten years old .
=He is _at___ the___ age__ of____ ten.
=He is a____ ten____ boy .
We write with our hands .
=We _use___our hands __to__ __write__ .