DIM a$

a$ = "Tonight ... you're in for AAAAA really big big show!"

PRINT
PRINT " ----------------------------[ Before ] -----------------------------"
PRINT
PRINT a$

REMOVE " really big" FROM a$

REMOVE CHR$(65) FROM a$

REPLACE "for " WITH "for a" IN a$

PRINT
PRINT " ----------------------------[ After ] -----------------------------"
PRINT
PRINT a$

Result:

 ----------------------------[ Before ] -----------------------------

Tonight ... you're in for AAAAA really big big show!

 ----------------------------[ After ] -----------------------------

Tonight ... you're in for a big show!