"a variety of"

[kelvin123]

There is a variety of systems.
There are a variety of systems.

There has been an array of equipment.
There have been an array of equipment.

A wide range of reform appear.
A wide range of reforms appears.

There is a number of reforms.
There are a number of reforms.

which are correct grammatically?
thanks

 

[euncu]

***neither a teacher nor a native-speaker***

Don't consider "a" or "an", just consider plurality or singularity.

PS: I don't know if some may prefer a proximity approach here, so you'd better wait for a teacher for a more detailed answer.

 

[Nightmare85]

There is a variety of systems. :tick:
There are a variety of systems.:cross:

There has been an array of equipment. :tick:
There have been an array of equipment. :cross:

A wide range of reform appears.:cross: - not very sure
A wide range of reforms appear[STRIKE]s[/STRIKE].:tick: - not very sure

There is a number of reforms.:tick:
There are a number of reforms.:cross:

**Neither a teacher nor a native speaker.**

Please check the underlined and check if you see the sense.

P.S: Let's wait until the teachers tell us their opinions.

Cheers!

 

[kelvin123]

May others express their views?

 

[corum]

I take 'variety of' as a phrasal quantifier similarly to 'lot(s) of'. In agreement with this view:

There are a variety of systems. :tick:
There is a variety of system. :cross:
There are a variety of sytem. :cross:

--
similarly:
A wide range of reforms appear. :tick:
There are a number of reforms. :tick:

 

[kelvin123]

Are you sure it is phrasal?