Das Fahrrad sind gelb - The/That bicycle are yellow
Das Fahrrad ist gelb - The/That ist yellow.
The first one doesn't make much sense. While the the second one is. The first one would need Fahrrad to be plural.
sie sind wie alt = how old are they Sie sind wie alt = how old are you n.b. the difference is in the capitalisation of the word Sie/sie
Chueli sind heilig!
Was sind Klippen = What are cliffs
Sind jungs denn dumm - ja sind sie = Are boys stupid - yes they are.
Was sind Amphibien? translates as What are amphibians?
Was sind Volkstribunen = What are people's tribunes
There are = Da sind There are = Es sind
'Beide Sind 'or 'Beides Sind', but it depends on the context
Sind Regiment was created in 1980.
Sind Sparrow was created in 1844.
sind = are (from the verb sein)
Wo sind sie = Where are they? Wo sind Sie = Where are you?