sentences:  There are various types of Singapore work visas starting from work permits for the lower-skilled labourers, to P1 and P2 category Employment Passes to attract niche professionals with good credentials in both education and work experience.From 1 September 2012 only foreign workers with earnings of at least SGD4,000 (USD3,150) per month can sponsor their spouses and children for their stay in Singapore and some of them are also not allowed to bring their parents and in-laws on long-term visit passes.The new regulation also impacts those who switch companies on/after the date, but foreign workers whose families are already in Singapore won't be affected.