broken

To be honest, I wouldn't say any of those sentences, VT. I might say these:

(a) The radio has been broken since last month.

(b) The radio broke last month.

The radio broke just now.

Do you mean, my sentences are wrong?

There might be a few contexts where you could use 3 in speech, but 1 and 2 are completely wrong.

Can I say,

(a) The radio was broken yesterday / last week.

(b) The radio is broken just now / now.

(c) The radio had broken yesterday / just now / last week.

(d) The radio has broken last week / now / just now.

Vincent TeoCan I say,

(a) The radio was broken yesterday / last week. Yes, and I'd say the word 'broken' is used as an adjective.

(b) The radio is broken just now / now. 'Now' is OK, but 'just now' would only work if it is used to mean 'at this particular moment' rather than 'just a moment ago'. However

Thanks for you explanation. But, I'm not very clear your explanation for (b). Can you tell me more detail?

The expression 'just now' has two different meanings. When it is used to mean "at this particular moment", it is usually a reference to something that is only temporarily true /something that is currently true, but only for a very limited time.

For example, if you call me and ask me to go shopping with you now, I might tell you that I am in the middle of cooking dinner, so I can't go an

Thanks, but what does it mean:

there is no justification for the use of the past perfect (had broken). ?

Can you explain to me? thanks!!