This question aims to capture productive paradigms of overt tense marking. 'Morphological marking on the verb' means that the marker has to form a phonological unit with the verb. The marking of tense can involve affixes, clitics, suppletion, tonal marking and/or reduplication. This feature aims to capture overt marking of present tense on the verb. Lack of other marking is not enough. There are instances where TAM can be expressed by a combination of an affix and auxiliary or particle. For example some grammarians state that present tense is expressed by a certain aspect on the verbal root and an auxiliary. If this is a productive and obligatory way of expressing present tense then such a construction triggers 1 for both this feature (GB082) and the feature on tense auxiliaries (GB121). If not all parts of the discontinuous marking are necessary for expressing present tense, then only consider the marking that is obligatory.
Sometimes a language is described as having a past/non-past distinction. In this case, if there is an overt marker of non-past code the language as 1 for this feature (GB082), but 0 for the feature on future tense GB084. Future tense needs to be more dedicated to actual future reference, whereas present tense has less strict demands on the scope of its function. This situation is mirrored for future/non-future which results in a 1 for GB082 and GB084 but a 0 for GB083 (if both have over markers). It is however not acceptable for a present tense marker to occur in both future and past contexts.
Swedish (ISO 639-3: swe, Glottolog: swed1254)
Swedish has a present tense marker -r (Skirgård p.c. 2020), as the table below shows. Swedish is coded as 1 for this feature.
Comrie, Bernard. 1985. Tense. Cambridge: Cambridge University Press
Dahl, Östen. 1985. Tense and aspect systems. Oxford: Blackwell.