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.
There are = Da sind There are = Es sind
Was sind Amphibien? translates as What are amphibians?
Was sind Volkstribunen = What are people's tribunes
sind = are (from the verb sein)
Sind Sparrow was created in 1844.
Sind Regiment was created in 1980.
'Beide Sind 'or 'Beides Sind', but it depends on the context
Wo sind sie = Where are they? Wo sind Sie = Where are you?