Question 1:
Las camisetas son modernas, los zapatos son modernos y la gorra es moderna.
Question 2:
La blusa es rosada, los pantalones son rosados y las faldas son rosadas.
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I use the same verbs so that is how the adjective goes to agree with the noun it accompanies.
Normally it is when the noun is feminine the adjective ends in "-a" and when it is masculine in "-o", but there are always exceptions. To form plurals, add an "-s" or "-es".
MissSpanish