TORONTO, May 1 (Reuters) - The Toronto Stock Exchange's main index slipped early on Thursday, tripped by falling energy and materials shares that reflected soft commodity markets.
The S&P/TSX composite index .GSPTSE was down 53.83 points, or 0.4 percent, at 13,883.21, with four of its 10 main groups in the red.
Suncor Energy (SU.TO) led all decliners, down C$2.62 at C$111.03 as the prices of both crude oil and natural gas moved inversely to the rising U.S. dollar.
On the upside, SNC-Lavalin Group Inc (SNC.TO), which said on Thursday it swung to a first-quarter profit, rose 96 Canadian cents to C$51.47.
$1=$1.02 Canadian Reporting by Jonathan Spicer; Editing by Scott Anderson