Simple present |
don't strengthen |
don't strengthen |
doesn't strengthen |
don't strengthen |
don't strengthen |
don't strengthen |
Present continuous |
am not strengthening |
are not strengthening |
is not strengthening |
are not strengthening |
are not strengthening |
are not strengthening |
Simple past |
didn't strengthen |
didn't strengthen |
didn't strengthen |
didn't strengthen |
didn't strengthen |
didn't strengthen |
Past continuous |
was not strengthening |
were not strengthening |
was not strengthening |
were not strengthening |
were not strengthening |
were not strengthening |
Simple future |
won't strengthen |
won't strengthen |
won't strengthen |
won't strengthen |
won't strengthen |
won't strengthen |
Future continuous |
will not be strengthening |
will not be strengthening |
will not be strengthening |
will not be strengthening |
will not be strengthening |
will not be strengthening |
Present perfect |
have not strengthened |
have not strengthened |
has not strengthened |
have not strengthened |
have not strengthened |
have not strengthened |
Present perfect continuous |
have not been strengthening |
have not been strengthening |
has not been strengthening |
have not been strengthening |
have not been strengthening |
have not been strengthening |
Present continuous |
am not strengthening |
are not strengthening |
is not strengthening |
are not strengthening |
are not strengthening |
are not strengthening |
Past perfect |
had not strengthened |
had not strengthened |
had not strengthened |
had not strengthened |
had not strengthened |
had not strengthened |
Past perfect continuous |
had not been strengthening |
had not been strengthening |
had not been strengthening |
had not been strengthening |
had not been strengthening |
had not been strengthening |
Future perfect |
will have not strengthened |
will have not strengthened |
will have not strengthened |
will have not strengthened |
will have not strengthened |
will have not strengthened |
Future perfect continuous |
will have not been strengthening |
will have not been strengthening |
will have not been strengthening |
will have not been strengthening |
will have not been strengthening |
will have not been strengthening |