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Ciii]{\lambda}{\lambda}1907, 1909 doublet emission line is a valuable toolfor exploring early star-forming galaxies. It has been proposed as a potentialalternative to the diminishing Ly{\alpha}{\lambda}1215.7 line for tracinggalaxies during the Epoch of Reionization. In this study, we investigate theutility of the Ciii] line as a proxy for Ly{\alpha} in the reionization era bycomparing the equivalent widths (EW) and velocity offsets of both emissionlines. Our analysis focuses on star-forming galaxies at z \sim 3 - 4 from theVANDELS survey. We examined the spectra of 773 objects, identifying therest-frame UV line Ciii]. Subsequently, we measured the EW of Ciii],Ly{\alpha}, and Heii. For objects displaying both Ciii] and Ly{\alpha}emission, the Ly{\alpha} velocity offsets was calculated. After removing 10potential AGNs from our analysis, we detected Ciii] emission in 280/773galaxies, with 139 receiving the highest confidence rating. The EW(Ciii]) hadan average \sim 6 {\AA}, while EW(Ly{\alpha}) had an average \sim 18 {\AA}.Among the subset that showed both Ciii] and Ly{\alpha} (52/139), the averageEW(Ciii]) was \sim 5 {\AA}, higher than those without Ly{\alpha} (EW(Ciii])\sim 3 {\AA}). Additionally, all 52 galaxies in the Ciii] and Ly{\alpha} subsetdisplayed a velocity shift ({\Delta}v_{Ly{\alpha}}), with average offset 533km/s. This expanded dataset provides valuable insights, including a positivecorrelation between EW(Ciii]) and EW(Ly{\alpha}), confirming earlier findings.Furthermore, we report a promising anti-correlation between EW(Ciii]) and{\Delta}v_{Ly{\alpha}}, which may serve as a tool for inferring Ly{\alpha}properties and potentially detecting ionized bubbles at z \gt 6.

Ciii] \lambda 1909 emission as an alternative to Ly{\alpha} in the  reionization era: the dependence of Ciii] and Ly{\alpha} at 3 < z < 4 from  the VANDELS survey