Questions & Answers about Υποτίθεται ότι το φυτό θέλει φως.
Υποτίθεται literally comes from a verb meaning to suppose / to assume, but in this kind of sentence it is usually used impersonally.
So Υποτίθεται ότι... means something like:
- It is supposed that...
- It is assumed that...
- Supposedly...
In everyday English, you would often translate the whole sentence more naturally rather than word-for-word.
Because this is an impersonal expression. Greek often uses third person singular forms in statements where English uses it:
- Υποτίθεται ότι... = It is supposed that...
- Φαίνεται ότι... = It seems that...
There is no real subject here in the usual sense. The verb just appears in the fixed third person singular form.