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Massive, merging galaxy clusters often host giant, diffuse radio sources thatarise from shocks and turbulence; hence, radio observations can be useful fordetermining the merger state of a cluster. In preparation for a larger study,we selected three clusters -- Abell 1319, Abell 1314, and RXC J1501.3+4220(Z7215) -- making use of the new LOFAR Two-Metre Sky Survey (LoTSS) at 120-168MHz, and together with archival data, show that these clusters appear to be inpre-merging, merging, and post-merging states, respectively. We argue thatAbell 1319 is likely in its pre-merging phase, where three separate clustercomponents are about to merge. There are no radio halos nor radio relicsdetected in this system. Abell 1314 is a highly-disturbed, low-mass clusterwhich is likely in the process of merging. This low-mass system does not show aradio halo, however, we argue that the merger activates mechanisms that causeelectron re-acceleration in the large 800 kpc radio tail associated withIC~711. In the cluster Z7215 we discover diffuse radio emission at the clustercenter, and we classify this emission as a radio halo, although it is dimmerand smaller than expected by the radio halo power versus cluster masscorrelation. We suggest that the disturbed cluster Z7215 is in its post-mergingphase. Systematic studies of this kind over a larger sample of clustersobserved with LoTSS will help constrain the time scales involved in turbulentre-acceleration and the subsequent energy losses of the underlying electrons.

Evolutionary phases of merging clusters as seen by LOFAR