[Grammar] About Passive form

[wotcha]

1. They can sometimes be seen feeding on vegetation overhanging the water.

2. They can sometimes be seen to feed on vegetation overhanging the water.


Which is correct?

 

[englishhobby]

Neither.
Use "can be seen" ("they can sometimes be seen").

 

[wotcha]

Neither.
Use "can be seen" ("they can sometimes be seen").

Oops sorry for the mistakes! I modified them. ^^;;;

 

[Pedroski]

Both fine!

 

[wotcha]

Both fine!

Then, can I say either 'She was seen to dance' or 'She was seen dancing'?

or..

'He was heard to sing' and 'He was heard singing' are both correct?

 

[Rover_KE]

Yes, they are.

Rover