Brooklyn riders have more reason to be angry about their F and G trains, with weeks of service outages returning to the lines.

Beginning Feb. 20, straphangers will have to ride shuttle buses to get to nine skipped stops between Jay Street and Church Avenue from 12:01 a.m. Saturday to 5 a.m. Monday. The disruptions will continue the weekend of Feb. 27, and be “on and off” for the next 11 months, NYC Transit spokeswoman Deirdre Parker said Monday.

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More than 60,000 straphangers commute from the stations on Saturdays and Sundays.

The MTA is rebuilding an old viaduct that carries the F and G in Brooklyn, and workers must suspend service while they are renovating the dormant express tracks, Parker said. The $179 million project will eventually include entire shutdowns of service along the lines, including closing the Smith-9 Sts station for nine months. Work is slated to wrap up in 2012.