Valid clusters undergo no change between their underlying and surface forms.

Would the surface forms remain hidden until the barrage was over?

His only previous opportunity to examine the surface forms had come from above and far away.

The project to develop surface forms for Mars was no different from any other major project.

Both kinds of underlying glottal stops may additionally be lost in the surface form.

In English give, gives, giving, gave and given are surface forms of the verb give.

The syntax of a language defines its surface form.

This change is also the cause for the present surface forms of the Finnish passive.

A programming language's surface form is known as its syntax.

Management was very eager to promote the use of these new curve and surface forms.