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Usually various grammatical clitics (e.g. verb's person) join the main word through concatenation in spelling, but by Nûrlâm convention they are written separately as stand-alone words when phonemes/words boundaries otherwise may produce:
However, when written in Tengwar, all words will be written without spaces anyway. But Latin separate spelling will ensure that no sound combination into a different character will occur in Tengwar transribers.
Please note, that these rules apply only to word inflection. During the derivation of new words adjacent sounds are often merge into one phoneme or transformed.