Mennad's head is too big for the helmet.

Did you lose your helmet?

Mennad wasn't wearing a helmet.

Tom might've been injured much worse if he hadn't been wearing a helmet.

Tom was wearing a helmet.

You need to put on your helmet.

Tom needs a helmet.

The helmethead gecko is the only vertebrate that can see colours at night.

Mennad's helmet is full of snot.

The soldiers are wearing iron helmets.