What are the IUPAC names for the five aliphatic structural isomers of C5H10?

CH₃-CH₂-CH₂-CH=CH₂  1-pentene (U.S.)  or  pent-1-ene (Brit.)

CH₃-CH₂-CH=CH-CH₃  2-pentene (U.S.)  or  pent-2-ene (Brit.)

CH₃-CH₂-C(CH₃)=CH₂  2-methyl-1-butene (U.S)  or  2-methylbut-1-ene (Brit.)

CH₃-CH=C(CH₃)-CH₃  2-methyl-2-butene (U.S.)  or  2-methylbut-2-ene (Brit.)

CH₂=CH-CH(CH₃)-CH₃  3-methyl-1-butene (U.S.)  or  3-methylbut-1-ene (Brit.)