The verb be in any of its forms (am, is, are, was, were, be, been, being) can be followed by another verb.  This verb should be in either the present participle or past participle form.

They are turn on* all the lamps
The office door is lock* in the evening
*) error indication

Pada contoh pertama, turn on seharusnya menjadi turning on karena hadir setelah are.  Pada contoh kedua, lock seharusnya menjadi locked karena hadir setelah is.

Pattern    :      
Verb forms after be:     Be +  1) Past Participle
                                                   2) Present Participle